CN1281326A - Channel distribution method for hierarchical cellular mobile communication system - Google Patents
Channel distribution method for hierarchical cellular mobile communication system Download PDFInfo
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Abstract
A channel distribution method in hierarchical cellular communication system features that the channels are dynamically distributed in macro-sub region, the channels are distributed in fixed mode in small region, and the service overflow in the regions in different layers is used to regulate the quantity of devices. Its advantages are fewer devices and lower complexity.
Description
The present invention relates to moving communicating field, relate in particular to the resource allocation techniques in the hierarchical cellular mobile communication system.
Along with the fast development of mobile communication, mobile communication subscriber sharply expands, and the capacity of mobile communication has been proposed more and more higher requirement.Yet because the frequency spectrum resource of mobile communication system is limited, increase capacity, just must improve the service efficiency of frequency spectrum resource for making system.For this reason, various systems increase-volume scheme has been proposed.For example, cell splitting, micro-cellular network, liner-overlapping, multi multiplexing pattern, frequency hopping, discontinuous transmission
Dynamics of channels distributes (DCA) also to carry out a large amount of research as a kind of method.In this method, channel of each sub-district picked at random has judged whether that adjacent cell is using this channel.If no, then use this channel, otherwise, attempt one other channel.After introducing this method, system need not carry out channel multiplexing planning again, and channel will dynamically use.By selecting good channel allocation strategy, the degree of scatter of channel is limited, then system will obtain the improvement of capacity.
Yet the application that dynamics of channels is distributed in the real system has the much bigger complexity of more traditional fixed channel assignment, some problem or even directly have influence on dynamic channel allocation and whether can be applied in the real system.Wherein following 2 is the bottleneck that dynamic channel allocation realizes: 1, dynamic channel allocation often needs a large amount of signaling exchanges of carrying channel status; 2, the dynamics of channels distribution requires each sub-district that the ability of using any available channel is all arranged.
Exchange this problem for reducing signaling, someone's scheme of proposing to solve.As, F.D.Priscoli, N.P.Magnani, V.Palestini, the article of F.Sestini etc. " Application of Dynamic Channel Allocation Strategies to the GSMCellular Network " (IEEE J-SAC Vol.15, No.8, Oct, 1997.pp1558-1567) the dynamics of channels dispensing applications problem at gsm system has been discussed.Think for dynamic channel allocation two big class modes are arranged: telephone traffic self adaptation and interference adaptive in the literary composition.Whether the former all needs to be severe in judgment when distributing each channel has same channel to be used in the channel multiplexing distance, and this scheme needs the signaling exchange of a large amount of transmission channels in the user mode of each position.Interference adaptive then is to judge when allocated channel whether this quality of channel satisfies the quality threshold requirement of channel allocation, distributes thresholding then to distribute this channel as long as satisfy.Therefore, we can solve by selecting the few DCA scheme based on interference adaptive of signaling request for the problem of signaling.And a wherein alternative class DCA scheme is exactly the dynamic channel allocation schemes of profile.This class scheme does not also require the data that obtain a large amount of overall situations, has therefore just reduced many to the requirement of signaling.Article " The Geometric Dynamic ChannelAllocation as a Practical Strategy in Mobile Networks with BurstyUser Mobility " (the IEEE Trans.Veh.Technol.Vol.44 of A.Baiocchi etc. and for example, No.1, Feb.1995.pp 14-23) how much DCA (GDCA) that mention and based on the DCA (CFDCA) of cost function also are the schemes that satisfies above-mentioned requirements.
But, also never be well solved for the problem of system equipment redundancy.In fact because dynamic channel allocation is based on the thought of all channel self-adaptings configurations, therefore also just require each sub-district all to have the ability of using each channel at any time.From this angle, the just essential transceiver that uses all channels that is equipped with in each sub-district is so surprising equipment disposition redundancy just occurred.
The objective of the invention is to overcome the deficiencies in the prior art part,, propose a signaling exchange and reduce in conjunction with the concrete condition of hierarchical cellular communication system, and the method for channel allocation in the hierarchical cellular communication system of system equipment configuration reduction.
The object of the present invention is achieved like this, method for channel allocation in a kind of hierarchical cellular communication system, each transceiver in this system all can be adjusted transceiver channel in real time, and the use of any one channel is based on the interference adaptive mode, it is characterized in that, according to predetermined initial channel allocation plan, the local channel of system is disposed to realizing that the overall situation covers and adopt the macrocell of dynamic channel allocation schemes allocated channel, and another part channel configuration is given the Microcell that adopts fixed channel assignment scheme allocated channel; In service in system, carry out channel allocation according to the following steps:
(1) when calling out arrival, at first judges whether and be its service by macrocell;
(2) if desired by the macrocell service, then also distribute for calling out selective channel according to the dynamic channel allocation schemes of macrocell employing, and commentaries on classics (9);
(3) for need not macrocell the calling of service, change (5);
(4) if macrocell does not have available channel to distribute, then change (8);
(5) the fixed channel assignment scheme that adopts according to Microcell when in the Microcell idle channel being arranged, then is the call distribution channel, and commentaries on classics (9);
(6) if Microcell does not have available channel to distribute, then calling is spilt in the corresponding macrocell and handle;
(7) in the time of can't providing channel for calling equally as if macrocell, then change (8);
(8) blocked call;
(9) add up according to the channel allocation success/miss data of each macrocell and Microcell, the channel configuration scheme of the Microcell in macrocell and its coverage is adjusted;
(10) finish.
Method for channel allocation in the hierarchical cellular mobile communication system of the present invention, concrete condition in conjunction with the hierarchical cellular mobile communication system, macrocell is adopted the dynamic channel allocation schemes allocated channel, Microcell is used fixed channel assignment scheme allocated channel, and overflow the not enough problem of conditioning equipment configuration, thereby can realize that dynamics of channels distributes with the equipment disposition that is slightly more than fixed channel assignment and less complexity by the telephone traffic of different layers sub-district.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is the block diagram of system of the cell mobile communication systems of application the inventive method;
Fig. 2 is the network planning schematic diagram of the hierarchical cellular mobile communication system of application the inventive method:
Fig. 3 is the initial channel configuration schematic diagram of the inventive method;
Fig. 4 is the channel allocation process flow chart of the inventive method;
Fig. 5 is that the channel configuration of the inventive method is adjusted flow chart.
We are example explanation the present invention with the GSM digital mobile communication system, but method of the present invention goes for the cell mobile communication systems of other types equally.
As shown in Figure 1, the mobile communication system of application the inventive method is included in several travelling carriages (MS) 14 that move in the system service district, base transceiver station (BTS) 13, base station controller (BSC) 12 and mobile switching centre (MSC) 11.Usually, base station controller a plurality of base transceiver stations good at managing.And a plurality of systems as shown in Figure 1 will link to each other by a mobile switching centre in a real system.Transceiver in this system all can be adjusted the channel (is that example is frequency and time slot with GSM) of transmitting-receiving in real time, so that be operated on any one channel.And the use of any one channel is based on this quality of channel, promptly based on the interference adaptive mode.
As shown in Figure 2, the inventive method is to be applied to the hierarchical cellular communication system, and 21 is macrocell among the figure, and 22 is Microcell.Can see that a macrocell and a plurality of Microcell have the area of coverage of repetition.In Fig. 2, the area of coverage of macrocell is repeated to cover by Microcell fully, and promptly the coverage of a macrocell is repeated to cover by seven Microcells.More generally situation may be, macrocell covers service area fully, and Microcell is local or all cover service area.
The inventive method is fit to general layering wireless cellular system, and Microcell is used fixed channel assignment scheme allocated channel, and macrocell is adopted the dynamic channel allocation schemes allocated channel.Macrocell realizes that the overall situation covers, and is preferably the fast moving mobile subscriber service is provided.In addition, macrocell also will provide service as dynamically replenishing to the calling of being overflowed by Microcell of Microcell channel.
Fig. 3 is that the inventive method is the schematic diagram that macrocell and the interior Microcell of its coverage carry out an embodiment of initial channel configuration.Among the figure all channel resources are divided into 31 (dash areas) and 32 (blank parts) two parts, are respectively applied for macrocell and Microcell.According to different telephone traffic distribution situations, 33,34,35 several different configuring conditions have been listed among the figure.Generally speaking, we think that most of telephone traffic is born by Microcell.Therefore, often give Microcell and distribute more channel resource.
For a new calling that produces or the channel assignment request of switching, the present invention carries out channel allocation according to channel allocation flow process as shown in Figure 4, and its step is as follows:
(1) when calling out arrival, at first judging whether according to parameters such as its translational speeds should (concrete judgement may have different realizations according to different systems for its service by macrocell, for example, can only insert macrocell in the area of having only macrocell to cover, perhaps when the user inserts Microcell according to existing direction and speed, will cause handover blanking time less than certain blanking time during threshold value, all should insert macrocell.Because this prior art content that is judged as does not belong to the scope that will set forth required for the present invention, so we suppose to have reliably and reasonably to judge the judgement of handling the access cell type);
(2) if desired by the macrocell service, dynamic channel allocation schemes (GDCA as previously described, CFDCA or other the feasible any Dynamic Assignment that adopts according to macrocell then.The dynamic channel allocation schemes possibility here is different, but all is to belong to category of the present invention) also distribute for calling out selective channel, and commentaries on classics (9);
(3) for need not macrocell the calling of service, change (5);
(4) if macrocell does not have available channel to distribute, then change (8);
(5) according to the fixed channel assignment principle, when in the Microcell idle channel being arranged, then be the call distribution channel, and commentaries on classics (9);
(6) if Microcell does not have available channel to distribute, then calling is spilt in the corresponding macrocell and handle;
(7) in the time of can't providing channel for calling equally as if macrocell, then change (8);
(8) blocked call;
(9) add up according to the channel allocation success/miss data of each macrocell and Microcell, the channel configuration scheme of the Microcell of macrocell and its covering is adjusted;
(10) finish.
Because the telephone traffic situation of system may constantly change, the initial channel configuration of system may will no longer be the resource distribution of optimizing after operation a period of time.The present invention is directed to this situation, propose a kind of channel configuration method of adjustment that is easy to realize.The realization of this method is based on the reporting of blocking rate data of sub-district.Here, the present invention supposes system's per 10 minutes statistics blocking rate situation (timing statistics may be different, and the present invention does not limit measurement period) in concrete realization, and carries out the transfer of channel resource between macrocell and Microcell according to statistical items.
Table 1 has provided the condition of channel resource configuration.In statistics, blocking rate＞P of macrocell M (i)
H_macro, and blocking rate＜P of certain the Microcell m (j) that covers together
L_microThe time, the present invention will shift the channel resource of Microcell in macrocell.Otherwise, in statistics, blocking rate＜P of macrocell M (i)
L_macro, and blocking rate＞P of certain the Microcell m (j) that covers together
H_microThe time, the present invention will shift the channel resource of macrocell in Microcell.Wherein, P
L_macroBlocking rate thresholding when shifting out (minimizing) for the macrocell channel, P
H_macroBlocking rate thresholding when moving into (increase) for the macrocell channel, P
L_microBlocking rate thresholding when shifting out (minimizing) for the Microcell channel, P
H_microBlocking rate thresholding when moving into (increase) for the Microcell channel.
| Adjust content | Macrocell blocking rate condition | Microcell blocking rate condition |
| X the channel transfer of Microcell m (i) used to macrocell M (i) | ????＞P h_macro | ????＞P 1_macro |
| Y the channel transfer of macrocell M (i) used to Microcell m (i) | ????＞P 1_macro | ????＞P h_micro |
Table 1
Table 2 has provided an embodiment who adjusts channel resource.As shown in table 2, when supposing to adjust channel configuration, macrocell and Microcell have Na1 and Ni1 to block user (when there was idle channel the sub-district, Na1 or Ni1 were for negative) respectively, and satisfy the requirement that channel resource is shifted to macrocell by Microcell.So we shift by Microcell X channel to macrocell.After the transfer, Microcell will not re-use this X channel, and macrocell then has the right to use of this X channel.So after adjusting, system will reduce the individual obstruction user of Na1-X-Pos (Na1-X).Equally, when channel resource by macrocell after Microcell shifts, system will reduce the individual obstruction user of Ni2-Y-Pos (Ni2-Y).
In the adjustment, determining of X, Y is important, and conservative adjustment can only be carried out when being transferred the sub-district for idle channel, and the number of channel of adjusting is no more than the idle channel number.The present invention gives a kind of reference algorithm of definite channel adjustment quantity.
Suppose that it is Nc1 that present sub-district has the number of channel, and under the telephone traffic situation of this statistics, the blocking rate Pb that reaches system requirements needs Nc2 channel, then we adjustable number of channel Nch is: Nch=[Pos (Nc1-Nc2)/2]
| Adjust content | Macrocell M (i) blocks number of users before adjusting | The obstruction number of users of Microcell m (i) before adjusting | M (j) blocks number of users after adjusting macrocell | M (j) blocks number of users after adjusting Microcell | Adjust back obstruction user and reduce number |
| X the channel transfer of Microcell m (i) used to macrocell M (j) | ????Na1 | ????Ni1 | ?Pos(Na1-X) | ????Ni1+X | ?Na1-X-Pos(Na1-X) |
| Y the channel transfer of macrocell M (j) used to Microcell m (i) | ????Na2 | ????Ni2 | ????Na2+Y | ?Pos(Ni2-Y) | Ni2-Y-Pos(Ni2-Y) |
Table 2
Fig. 5 is a flow chart of adjusting channel resource in the inventive method, and set-up procedure is as follows:
(1) obtains new sub-district blocking rate data;
(2) judge whether to satisfy the condition of channel adjustment according to data;
(3) do not satisfy condition, change (5);
(4) satisfy condition, then carry out channel adjustment;
(5) finish.
When a plurality of Microcells satisfy regularization condition, the present invention will adjust object according to the size decision of the idle channel proportion of each sub-district.The preferential big sub-district of idle channel ratio of adjusting.
Wherein [.] expression rounds.
Claims (5)
1. the method for channel allocation in the hierarchical cellular communication system, each transceiver in this system all can be adjusted transceiver channel in real time, and the use of any one channel is based on the interference adaptive mode, it is characterized in that, according to predetermined initial channel allocation plan, the local channel of system is disposed to realizing that the overall situation covers and adopt the macrocell of dynamic channel allocation schemes allocated channel, and another part channel configuration is given the Microcell that adopts fixed channel assignment scheme allocated channel; In service in system, carry out channel allocation according to the following steps:
(1) when calling out arrival, at first judges whether and be its service by macrocell;
(2) if desired by the macrocell service, then also distribute for calling out selective channel according to the dynamic channel allocation schemes of macrocell employing, and commentaries on classics (9);
(3) for need not macrocell the calling of service, change (5);
(4) if macrocell does not have available channel to distribute, then change (8);
(5) the fixed channel assignment scheme that adopts according to Microcell when in the Microcell idle channel being arranged, then is the call distribution channel, and commentaries on classics (9);
(6) if Microcell does not have available channel to distribute, then calling is spilt in the corresponding macrocell and handle;
(7) in the time of can't providing channel for calling equally as if macrocell, then change (8);
(8) blocked call;
(9) add up according to the channel allocation success/miss data of each macrocell and Microcell, the channel configuration scheme of the Microcell in macrocell and its coverage is adjusted;
(10) finish.
2. method for channel allocation according to claim 1 is characterized in that: in described system step (9) of carrying out channel allocation in service, the condition of channel configuration adjustment is: in statistics, and blocking rate＞P of macrocell M (i)
H_macro, and blocking rate＜P of certain the Microcell m (j) that covers together
L_microThe time, the present invention will shift the channel resource of Microcell in macrocell; Otherwise, in statistics, blocking rate＜P of macrocell M (i)
L_macro, and blocking rate＞P of certain the Microcell m (j) that covers together
H_microThe time, the present invention will shift the channel resource of macrocell in Microcell, wherein P
L_macroBlocking rate thresholding when shifting out (minimizing) for the macrocell channel, P
H_macroBlocking rate thresholding when moving into (increase) for the macrocell channel, P
L_microBlocking rate thresholding when shifting out (minimizing) for the Microcell channel, P
H_microBlocking rate thresholding when moving into (increase) for the Microcell channel.
3. method for channel allocation according to claim 1 is characterized in that: in described system step (9) of carrying out channel allocation in service, set-up procedure is as follows:
(1) obtains new sub-district blocking rate data;
(2) judge whether to satisfy the condition of channel adjustment according to data;
(3) do not satisfy condition, change (5);
(4) satisfy condition, then carry out channel adjustment;
(5) finish.
4. method for channel allocation according to claim 1 is characterized in that: in described system step (9) of carrying out channel allocation in service, when a plurality of Microcells satisfy regularization condition, preferentially adjust the big sub-district of idle channel ratio.
5. method for channel allocation according to claim 1 is characterized in that: in described system step (9) of carrying out channel allocation in service, determine that channel adjustment quantity can calculate according to following formula:
Nch=[Pos (Nc1-Nc2)/2] wherein, Nc1 is that present sub-district has the number of channel, and Nc2 is for being issued to the needed number of channel of blocking rate of system requirements in the telephone traffic situation of this statistics, and Nch is the adjustable number of channel,
[.] expression rounds.
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