CN101998650A - Channel allocation method and system in wireless communication system - Google Patents
Channel allocation method and system in wireless communication system Download PDFInfo
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- CN101998650A CN101998650A CN2009101668067A CN200910166806A CN101998650A CN 101998650 A CN101998650 A CN 101998650A CN 2009101668067 A CN2009101668067 A CN 2009101668067A CN 200910166806 A CN200910166806 A CN 200910166806A CN 101998650 A CN101998650 A CN 101998650A
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Abstract
The invention discloses a channel allocation method and a channel allocation system in a wireless communication system. The method comprises the following steps of: dividing a user terminal region managed by a serving base station of each cell into a central user and edge users by the serving base station; arranging a central control unit for managing more than one cell, wherein the serving base station of each cell performs channel allocation on the central user in the cell; and performing combined channel allocation on all the edge users in the managed cell by the central control unit. The method and the system have higher performance while reducing the interference among cells.
Description
Technical field
The present invention relates to wireless communication technology field, refer to the method for channel allocation in a kind of wireless communication system especially, and channel assigning system.
Background technology
For the LTE system, when carrying out channel allocation, need consider interference coordination in many minizones.Existing static Inter-Cell Interference Coordination scheme mainly contains two kinds: partial frequency multiplexing (FractionalFrequency Reuse, FFR) and soft-frequency reuse (Soft Frequency Reuse, SFR).The main thought of these two kinds of schemes all is to be 1 multiplexing whole frequency band at center of housing estate with the multiplexing factor, comes multiplexing whole frequency band at cell edge with the multiplexing factor greater than 1.
Be distributed as example with sub-district shown in Figure 1, the partial frequency multiplexing scheme is divided into two parts with whole frequency band shown in Fig. 2 (a), the central user service band 1 of each sub-district, edge customer service band 2.Wherein, the dash area of Fig. 1 is the central user region, and other parts are the edge customer region.Further, for fear of presence of intercell interference, the sub-band that the FFR scheme is divided into frequency band 2 quadrature again uses for a plurality of sub-districts adjacent on the geographical position.Such as, the edge band of corresponding oblique line filling part as this sub-district only used in each sub-district.The soft-frequency reuse scheme is shown in Fig. 2 (b), in this scheme, whole frequency band can be used in each sub-district, but cell edge can only use the part of whole frequency band, and the frequency band that the edge customer of neighbor cell uses is mutually orthogonal, on the basis of this bandwidth assignment, make system reach more excellent performance by the service power ratio β that regulates central user and edge customer.
These two kinds of static coordination schemes can reach the purpose that reduces presence of intercell interference by the frequency duplex factor as one of raising system, but have but reduced spectrum efficiency, can not utilize the frequency diversity of ofdm system fully.
In addition, the coordinated scheduling scheme that a kind of fast cell is selected is proposed among the 3GPP RAN WG1 R1-0903 14,2009.In this scheme, the user avoids main interference by cell selecting fast, and all users in cooperation cell can jointly be dispatched.As can be seen, the computation complexity of this scheme and signaling consumption are all very high.
Therefore, need to propose new method for channel allocation and system, when reducing presence of intercell interference, have more excellent performance.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for channel allocation in a kind of wireless communication system, central user is dispatched separately in each sub-district, and edge customer is carried out multi-plot joint dispatching, make that each user has an opportunity dynamically to select its best channel from whole frequency band, thereby make whole system can obtain bigger frequency diversity and user diversity.Described channel can use time, frequency or channel code to realize.
Another purpose of the present invention is to provide the method for channel allocation in a kind of wireless communication system, each transmission cycle is divided into four time slots at the most, central user is dispatched at different time slots respectively with edge customer, each user can take whole frequency band when scheduling, to obtain bigger frequency diversity.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Method for channel allocation in a kind of wireless communication system, this wireless communication system comprises a plurality of sub-districts, this method comprises:
The serving BS of each sub-district is divided into central user and edge customer with its user terminal of administering;
Be provided for administering the centralized control unit of an above sub-district, the serving BS of each sub-district carries out channel allocation to the central user in this sub-district, and described centralized control unit carries out combined channel to all edge customers in the administration sub-district and distributes.
Its user terminal of administering is divided into central user to the serving BS of described each sub-district and edge customer comprises:
Described serving BS receives the large scale decline information of its user terminal to send up of administering, and determines the user type of this user terminal according to described large scale decline information;
If this user terminal to the decline of the large scale of serving BS and to the difference of the large scale decline of strong jamming base station greater than default thresholding, determine that then this user terminal is a central user, otherwise definite this user terminal is an edge customer.
The serving BS of described each sub-district carries out channel allocation to the central user in this sub-district and comprises:
A1, described serving BS are determined the first user dispatching sequence of one or more central user in this sub-district, arrange the corresponding relation of central user and channel according to the described first user dispatching sequence;
A2, determine the current corresponding relation that comes at first points among the described first user dispatching sequence first central user and first channel, obtain the number of busy channel of described first central user, judge whether to surpass the central user maximum channel number, if surpass then this first central user is deleted from the described first user dispatching sequence;
A3 otherwise, give described first central user with described first channel allocation, again this first channel is deleted from the described first user dispatching sequence, and other user in this sub-district is set to take described first channel.
Described steps A 1 comprises: for this sub-district is provided with first tabulation of user-channel, determine gain or the fairness parameter of all central user on all channels in this sub-district, it is right to arrange corresponding user-channel according to described gain or fairness parameter descending ground, and described user-channel is recorded in putting in order according to this in described user-channel first tabulation;
Then steps A 2 described this first central user is deleted from the described first user dispatching sequence comprise: with all user-channels of the described first central user correspondence to deletion from described user-channel first tabulation;
Steps A 3 described this first channel is deleted from the described first user dispatching sequence comprise: with all user-channels of the described first channel correspondence to deletion from described user-channel first tabulation.
The serving BS of described each sub-district carries out channel allocation to the central user in this sub-district and further comprises: after steps A 3, further determine first central user that the current corresponding relation that comes at first points among the described first user dispatching sequence, the Signal to Interference plus Noise Ratio SINR and the default thresholding that obtain this first central user compare, if be lower than described default thresholding then finish channel allocation, otherwise return execution in step A2 to central user in this sub-district.
This method further comprises: after the channel allocation of central user finished, described serving BS sent to the situation of the edge customer in this sub-district on available channel the centralized control unit of this sub-district of administration.
Described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district and comprises:
B1, this centralized control unit receive the SINR of all edge customers of the serving base stations report of its each sub-district of administering, and determine the second user dispatching sequence of one or more edge customer in the sub-district of administering according to described SINR, arrange the corresponding relation of edge customer and channel according to the described second user dispatching sequence;
B2, determine the current corresponding relation that comes at first points among the described second user dispatching sequence first edge customer and first channel, obtain the number of busy channel of described first edge customer, judge whether to surpass the edge customer maximum channel number, if surpass then this first edge customer is deleted from the described second user dispatching sequence;
B3 otherwise, give described first edge customer with described first channel allocation, and be set to take described first channel with other edge customer that first edge customer has strong jamming relation, other user in this sub-district, first edge customer place also is set to take described first channel, deletes from the described second user dispatching sequence with the corresponding relation of first channel and first edge customer and first channel with the corresponding relation that described first edge customer has other edge customer of strong jamming relation again.
Other edge customer that described and first edge customer have strong jamming relation comprises: on first channel first edge customer is formed edge customer in the most strongly disturbing sub-district and the most strongly disturbing edge customer that is subjected to sub-district, the first edge customer place on first channel.
Described step B 1 comprises: described centralized control unit is provided with second tabulation of user-channel, gain or the fairness parameter of edge customer on all available channels in all sub-districts of determining to be administered, it is right to arrange corresponding user-channel according to described gain or fairness parameter descending ground, and described user-channel is recorded in putting in order according to this in described user-channel second tabulation;
Then described this first edge customer is deleted from the described second user dispatching sequence of step B2 comprises: with all user-channels of the described first edge customer correspondence to deletion from described user-channel second tabulation.
This method further comprises:
Described centralized control unit receives the strong jamming cell number of all edge customers of the serving base stations report of its each sub-district of administering, generates strong jamming table;
Other edge customer that has strong jamming relation with first edge customer among the then described step B3 is set to take described first channel and comprises:
Determine the strong jamming sub-district of described first edge customer on described first channel according to described strong jamming table, all edge customers in this strong jamming sub-district are set to take described first channel;
Determine that according to described strong jamming table by the most strongly disturbing edge customer in described first sub-district, edge customer place, the most strongly disturbing edge customer of described quilt is set to take described first channel on described first channel.
Described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district and further comprises: after step B3, judge whether described user-channel second tabulation is empty, if, otherwise return execution in step B2 for empty then finish the combined channel of edge customer is distributed.
This method further comprises: after the combined channel of edge customer distributed end, described centralized control unit sent to the channel allocation situation of edge customer the serving BS of respective cell.
This method further comprises: after the serving BS of each sub-district carries out channel allocation to the central user in this sub-district, the situation of edge customer in this sub-district on available channel sent to the centralized control unit of this sub-district of administration, described centralized control unit carries out combined channel to all edge customers in the administration sub-district and distributes according to the situation of described edge customer on available channel;
Perhaps, after described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district, the channel allocation situation of edge customer is sent to the serving BS of respective cell, the serving BS of each sub-district carries out channel allocation according to the channel allocation situation of described edge customer to the central user in this sub-district.
This method further comprises: a plurality of microzonations that comprise in the described wireless communication system are assigned in one or more channel allocation groups all sub-districts in channel allocation group of each centralized control unit administration.
This method further comprises: described one or more channel allocation groups are distributed according to the combined channel that dispatching sequence between the group that sets in advance carries out edge customer, put in order formerly channel allocation group after channel allocation finishes, the channel allocation situation of its edge customer is sent to other channel allocation group.
This method further comprises: after the combined channel of the channel allocation of central user and edge customer distributed, each serving BS was determined the residue channel of self sub-district, and it is distributed to the central user of this sub-district.
The residue channel that described each serving BS is determined self sub-district comprises: described serving BS is searched as yet not by the available channel of the CU in this sub-district; Perhaps
Described serving BS is searched in this sub-district, and the busy channel number is released to the residue channel less than the edge customer of edge customer minimum channel number with all channels of distributing to this edge customer.
Method for channel allocation in a kind of wireless communication system comprises:
The serving BS of each sub-district is divided into central user and edge customer with its user terminal of administering, and corresponding mode of operation is set;
Position relation according to a plurality of sub-districts in the wireless communication system is provided with the mode of operation of each sub-district at each channel;
The serving BS of each sub-district provides communication according to set mode of operation for user terminal on the channel that is distributed.
Described position relation according to a plurality of sub-districts in the wireless communication system is provided with each sub-district and comprises in the mode of operation of each channel:
Each seeervice cycle of each sub-district is divided into four time slots at the most, and this sub-district mode of operation of a time slot therein is set to edge pattern, is set to center mode in the mode of operation of other time slot; Wherein, under described center mode, the base station uses low transmitting power to serve central user; Under described edge pattern, the base station uses high transmit power to serve edge customer;
In same time slot, a sub-district is set to edge pattern, and its all neighbor cells are set to center mode.
Described position relation according to a plurality of sub-districts in the wireless communication system is provided with each sub-district and comprises in the mode of operation of each channel: each microzonation is divided into three sectors, same sub-district has only a sector to be in edge pattern at same time slot, and other sector is in center mode; Wherein, under described center mode, the base station uses low transmitting power to serve central user; Under described edge pattern, the base station uses high transmit power to serve edge customer.
A kind of channel assigning system comprises:
One or more serving BS, each serving BS are used for administering one or more user terminal of a sub-district;
One or more centralized control unit, each centralized control unit is used to administer one or more sub-district;
Described serving BS is further used for the user terminal in the administration sub-district is divided into central user and edge customer, and by the central user in the administration sub-district carry out channel allocation;
Described centralized control unit be further used for by all edge customers in the administration sub-district carry out combined channel and distribute.
Described user terminal is used for the large scale decline feedback information of self is given the serving BS of this user terminal of administration;
Described serving BS is used for determining according to large scale decline information the user type of this user terminal, if this user terminal to the decline of the large scale of serving BS and to the difference of the large scale decline of strong jamming base station greater than default thresholding, determine that then this user terminal is a central user, otherwise determine that this user terminal is an edge customer.
Described serving BS is used for:
Determine the first user dispatching sequence of one or more central user in this sub-district, arrange the corresponding relation of central user and channel according to the described first user dispatching sequence;
Determine the current corresponding relation that comes at first points among the described first user dispatching sequence first central user and first channel, obtain the number of busy channel of described first central user, judge whether to surpass the central user maximum channel number, if surpass then this first central user is deleted from the described first user dispatching sequence;
Otherwise, give described first central user with described first channel allocation, again this first channel is deleted from the described first user dispatching sequence, and other user in this sub-district is set to take described first channel.
Described centralized control unit is used for:
Receive the SINR of all edge customers of the serving base stations report of its each sub-district of administering, and determine the second user dispatching sequence of one or more edge customer in the sub-district of administering according to described SINR, arrange the corresponding relation of edge customer and channel according to the described second user dispatching sequence;
Determine the current corresponding relation that comes at first points among the described second user dispatching sequence first edge customer and first channel, obtain the number of busy channel of described first edge customer, judge whether to surpass the edge customer maximum channel number, if surpass then this first edge customer is deleted from the described second user dispatching sequence;
Otherwise, give described first edge customer with described first channel allocation, and be set to take described first channel with other edge customer that first edge customer has strong jamming relation, other user in this sub-district, first edge customer place also is set to take described first channel, deletes from the described second user dispatching sequence with the corresponding relation of first channel and first edge customer and first channel with the corresponding relation that described first edge customer has other edge customer of strong jamming relation again.
Described centralized control unit is arranged on one of them serving BS of one or more sub-district of being administered; Perhaps
Described centralized control unit is a radio network controller (RNC).
As seen from the above technical solution, this dynamic syndicated channel assignment scheme of the present invention based on the user, when in the multi-cell OFDMA system, carrying out downlink transfer, at the edge customer in all cooperation cell, the dynamic channel allocation of uniting according to the instantaneous channel status of described edge customer.Further, utilize channel assignment table to characterize allocation result and the main form that disturbs between channel and the user; Utilize user-channel list to determine the user of scheduling next time and should distribute to this user's channel.Further, the present invention also proposes a kind of cell group method, is used for reducing the computation complexity of multi-plot joint channel allocation.This method is according to the spatial distribution of each sub-district, these microzonations are assigned in the different channel allocation groups, group is carried out channel allocation one by one then, the dispatching sequence can dynamically adjust according to the virtual condition of sub-district between the group of each channel allocation group, determines dispatching sequence between group such as the loading condition according to the sub-district.
In addition, in the present invention, adopt " cell breathing " this new static coordinating district interference scheme, each downlink transfer cycle of whole network is divided into several slots, rationally arrange the mode of operation (center mode or edge pattern) of each sub-district at each time slot, thereby realize the interference coordination of a plurality of minizones.By the method for channel allocation of this cell breathing, all be with can taking whole frequency band per family, thereby obtain maximum frequency diversity.Further, the present invention proposes under many cell networkings situation, be the basic principle of each cell allocation mode of operation, the mode of operation of many cell networkings is set, thereby reduce presence of intercell interference by these principles.
Description of drawings
Fig. 1 is the schematic diagram that the medium and small district of the cellular network of prior art distributes;
Fig. 2 (a) is the channel allocation schematic diagram of component frequency multiplexing scheme in the prior art;
Fig. 2 (b) is the channel allocation schematic diagram of soft-frequency reuse scheme in the prior art;
Fig. 3 is the method flow diagram of dynamic syndicated channel allocation in the first embodiment of the invention;
The method flow diagram of Fig. 4 in the first embodiment of the invention central user being dispatched separately;
Fig. 5 is for carrying out the method flow diagram of multi-plot joint dispatching to all edge customers in the first embodiment of the invention;
Fig. 6 is the schematic diagram of cell group in the first embodiment of the invention;
Fig. 7 is the system construction drawing of channel allocation in the first embodiment of the invention;
Fig. 8 is that the mode of operation of the many sub-districts of three time slots in the second embodiment of the invention is distributed schematic diagram;
Fig. 9 distributes schematic diagram for three time slots in the second embodiment of the invention divide the mode of operation of sector cell;
Fig. 10 is that the mode of operation of a plurality of arbitrary shapes sub-district in the second embodiment of the invention is distributed schematic diagram;
Figure 11 is the throughput emulation schematic diagram of β in the first embodiment of the invention=0.4 o'clock dynamic syndicated channel assignment scheme;
Figure 12 is the throughput emulation schematic diagram of β in the first embodiment of the invention=0.5 o'clock dynamic syndicated channel assignment scheme;
Figure 13 is the throughput emulation schematic diagram of β in the first embodiment of the invention=0.6 o'clock dynamic syndicated channel assignment scheme;
Figure 14 is the throughput emulation schematic diagram of β in the second embodiment of the invention=0.4 o'clock cell breathing scheme;
Figure 15 is the throughput emulation schematic diagram of β in the second embodiment of the invention=0.5 o'clock cell breathing scheme;
Figure 16 is the throughput emulation schematic diagram of β in the second embodiment of the invention=0.6 o'clock cell breathing scheme.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Multi-cell channel distribution method in the wireless communication system that the present invention proposes adopts dynamic syndicated channel allocation or cell breathing scheme, when realizing Inter-Cell Interference Coordination, obtains bigger frequency diversity.
First embodiment: dynamic syndicated channel assignment scheme
It may be noted that in the whole channel allocation of this scheme and will use three kinds of forms: channel assignment table, user-channel list and strong jamming table.
Wherein, channel assignment table is used for representing the channel of scheduling process and user's distribution condition, the possible value of each list item is 0,1 or-1,0 this channel of expression can be by certain CU (available channel), 1 this channel of expression is by corresponding CU, and-1 this channel of expression can not be by corresponding CU.
Each list item in user-channel list is that a user-channel is right, and these list items carry out descending according to the gain or the fairness parameter etc. of user on channel, are used for determining the allocation order of scheduling process.Such as, table 1 is a concrete user-channel list, records 6 list items, according to gain ordering from big to small.As can be seen, the gain maximum of user 3 on channel 1 will be assigned with earlier in scheduling.
Table 1
When specific implementation, user-channel list is divided into first tabulation and second tabulation again, and wherein first tabulation of user-channel is used to determine the dispatching sequence of central user, and second tabulation of user-channel is used to determine the dispatching sequence of edge customer.
Strong jamming table is used to write down each user's strong jamming sub-district, so that avoid presence of intercell interference in scheduling process.
Fig. 3 comprises for carrying out the method flow diagram of dynamic syndicated channel allocation in the one embodiment of the invention:
Step 30 1: each user terminal obtains large scale decline (the large scale fading) feedback information of self and gives serving BS, is determined the user type of this user terminal by serving BS.Particularly, this user type comprises two kinds of central user and edge customers.At each sub-district, its serving BS is divided into two groups with all user terminals in this sub-district according to its user type (central user or edge customer).
Further, user terminal also can be with out of Memory in the step 301, such as Signal to Interference plus Noise Ratio (the Signal to Interference plus Noise Ratio of this user terminal on all channels, SINR), on all channels, cause pairing cell number in strong jamming base station etc., feed back to serving BS.
Step 302: in each sub-district, central user is carried out channel allocation.This step is carried out by the serving BS of each sub-district, and specific implementation is referring to Fig. 4.
Step 303: the combined channel that carries out edge customer in a plurality of minizones distributes, and the specific implementation of this step is referring to Fig. 5.
Step 304: determine through the residue channel after the above-mentioned distribution, described residue channel is redistributed central user to each sub-district.The process of redistributing in this step can be with reference to step 302.
Particularly, determine in the step 304 that the operation of residue channel comprises: searching can be by the channel of CU (such as the channel that still is labeled as 0 after the distribution through step 302 and 303, or being called available channel) in the channel assignment table.Perhaps, search the number of channel that has been assigned to edge customer, all channels of distributing to this edge customer are discharged, become the residue channel less than predetermined number.Such as, seek the busy channel number and count n less than the edge customer minimum channel
Min, eEdge customer, these edge customers are set to all list items of 1 and change 0 in channel assignment tables.As can be seen, because the number of channel that these edge customers are assigned to is very few, even for these edge customers provide communication, its communication quality also can't be guaranteed, therefore these edge customers can be ignored, and Internet resources are discharged to other user's use in the system.
Need to prove that step 304 is not requisite when specific implementation.
By above four steps, each user has an opportunity dynamically to select its best channel from whole Internet resources (such as frequency band, seeervice cycle, channel code etc.), thereby make system obtain bigger frequency diversity gain and user diversity gain, and this channel allocation result can avoid presence of intercell interference, guarantees the throughput of each user and sub-district simultaneously.
In addition, when specific implementation method shown in Figure 3, can be that central user allocated channel and step 303 are introduced the user fairness algorithm during for edge customer associating allocated channel in step 302, for example: equitable proportion (PF) algorithm.That is to say that when determining the user dispatching sequence of center or edge customer, the fairness parameter (such as the equitable proportion factor) on each channel sorts according to each center or edge customer, obtains user-channel list.
Have, method shown in Figure 3 is first execution in step 302 back execution in step 303, is called " central user is preferential " algorithm again.Certainly, step 302 and step 303 also can exchange execution sequence when specific implementation.Method for first execution in step 303 back execution in step 302 is called " edge customer is preferential " algorithm, and " edge customer is preferential " algorithm can be avoided the situation that all channels are all taken by central user in the sub-district.In actual applications, " central user is preferential " and " edge customer is preferential " these two kinds of algorithms can dynamically be adjusted according to the actual loading (for example ratio of central user and edge customer) of whole network.Such as, when edge customer is occupied an leading position, can use " central user is preferential " algorithm in network, to guarantee the performance of central user.
Fig. 4 is illustrated in the method flow of in certain sub-district central user being dispatched separately, and described independent scheduling is meant that channel allocation and another sub-district of the central user of certain sub-district are independently to carry out, and does not influence each other between the two.This method specifically comprises:
Step 401: obtain the gain of all central user on each channel in this sub-district, line up first tabulation of user-channel by the big or small descending of gain, each list item is that a user-channel is right.
During underway heart user's channel allocation, all there is user-channel first tabulation of self each sub-district, writes down the corresponding relation of all central user in all channels and this sub-district.
Step 402: the busy channel that detects list item (i.e. first list item) the institute's respective user (being assumed to be user j) that makes number one in first tabulation of user-channel is counted m.
Step 403: busy channel is counted m and central user maximum channel number n more
Max, cIf busy channel is counted m and is not reached n as yet
Max, c, then execution in step 404; Otherwise, delete that all relate to the list item of user j in first tabulation of this user-channel, and return execution in step 402.Wherein, the respective user j of first list item institute is the user of maximum gain correspondence.
Step 404: the channel (being assumed to be channel i) of the first list item correspondence in first tabulation of user-channel is distributed to corresponding user's (being user j).
Step 405: upgrade first tabulation of user-channel, all list items that relate to channel i are wherein all deleted.
Step 406: upgrade channel assignment table, the list item of channel i and user j correspondence wherein is changed to 1, the list item of other user on channel i of sub-district, user j place is changed to-1.
Step 407: repeated execution of steps 402 is to step 406, and till the channel status difference of channel status than edge customer of the central user of this sub-district, flow process finishes.
Particularly, serving BS judges whether the SINR of the current list item institute respective user that makes number one in user-channel first tabulation is lower than default thresholding, if be lower than then judge that the channel status of central user is worse than edge customer.
It is pointed out that each sub-district in the system can carry out the channel allocation of central user according to method shown in Figure 4.In addition, it is right also can to arrange user-channel according to ascending order in the step 401, and what detect in the step 402 so is the list item that comes last position in first tabulation of user-channel.That is to say that no matter how the list item in first tabulation of user-channel sorts, what detect all is that the maximum user-channel of current gain is right at every turn.
Fig. 5 illustrates the method flow that all edge customers is carried out multi-plot joint dispatching, specifically comprises:
Step 501: obtain the gain of each edge customer on available channel in all sub-districts, its descending is lined up second tabulation of user-channel.
Step 502-503: whether the number of busy channel that detects first list item institute respective user in second tabulation of user-channel reaches edge customer maximum channel number n
Max, eIf, reach, delete then that all comprise this user's list item in user-channel second tabulation, and return execution in step 502, otherwise execution in step 504.
Step 504: give corresponding user with the channel allocation of the first list item correspondence in user-channel second tabulation, suppose channel i is distributed to edge customer j in the sub-district 1.
Step 505: upgrade channel assignment table and second tabulation of user-channel.Wherein, step 505 specifically comprises 5051-5053.
505 1: pairing that list item of the edge customer j of channel i in the channel assignment table and sub-district 1 is changed to 1, and all other users in this sub-district 1 (comprising central user and other edge customer) are changed to-1 at the corresponding list item of channel i.Simultaneously, with list item (edge customer j, the channel i) deletion in second tabulation of user-channel.
5052: determine edge customer j is formed the most strongly disturbing sub-district 2 on channel i according to strong jamming table, the list item of all edge customers on channel i with this sub-district 2 in channel assignment table is changed to-1, uses channel i that the edge customer j of sub-district 1 is produced strong jamming with the edge customer that prevents sub-district 2.Simultaneously, in user-channel second tabulation, with all edge customers of sub-district 2 correspondence table entry deletion at channel i.
Need to prove that when certain channel of a sub-district was assigned to the edge customer of this sub-district, can there be following three kinds of mode of operations the strong jamming sub-district of this sub-district on this channel: keep silent on this channel; Use to its central user this channel allocation; Carry out joint transmission with this sub-district to this edge customer.Further, the selection of the mode of operation of above-mentioned strong jamming sub-district can be dynamic.Such as, when the higher user throughput of needs, can use the transmission mode that takies this channel by central user; When Cell Edge User needs the lower error rate, can use the joint transmission pattern.
5053: the most strongly disturbing edge customer of determining on channel i, will be subjected to sub-district, user j place 1 according to strong jamming table, these edge customers are set to can not busy channel i, be about to its corresponding list item in channel assignment table and be changed to-1, and upgrade second tabulation of user-channel synchronously.
In the implementation procedure of step 505,505 1 at be all other users of sub-district, edge customer j place, 5052 at be that edge customer j is constituted the edge customer of strongly disturbing other sub-district, and 5053 at be to be subjected to the edge customer of strongly disturbing other sub-district of sub-district, edge customer j place.Therefore do not influence each other between this three sub-steps, need not to limit its execution sequence, such as can be according to the order execution in step 505 described renewals of 5052-5053-505 1.
Step 506: repeated execution of steps 502-505, for empty, flow process finishes up to second tabulation of user-channel.
Below lift an instantiation, the method for channel allocation that Fig. 3-Fig. 5 is provided is described in detail.Have 4 distributable channels in the supposing the system, and the cooperation cell that need carry out channel allocation comprises: sub-district A, sub-district B, sub-district C.Wherein, user 1-3 is positioned at sub-district A, and user 1 and 2 is central user, and user 3 is edge customers; User 4-6 is positioned at sub-district B, and user 4 and 5 is central user, and user 6 is edge customers; User 7-9 is positioned at sub-district C, and user 7 and 8 is central user, and user 9 is edge customers.The strong jamming table of these edge customers is as shown in table 2.Wherein, the sub-district outside the above-mentioned cooperation cell is represented in other sub-district, is exactly other sub-district such as producing strongly disturbing at 2 pairs of edge customers of channel 3.
Table 2
1, refer step 406, tabulate according to the user-channel first of each sub-district and carry out the channel allocation of central user, and the channel assignment table that obtains is as follows:
Table 3
Such as, at sub-district A, user's 1 busy channel 2, user's 2 busy channels 3.So far, the channel allocation of central user finishes.
2, the form shown in the table 1 is tabulated as user-channel second, then user-the channel of first list item is to being (user 3, channel 1), and 505 pairs of channel assignment tables of refer step and second tabulation of user-channel are made amendment, upgraded.Particularly:
With reference to 505 1: user in the channel assignment table 3 is changed to 1 at the list item of channel 1, all other users among the A of sub-district (being user 1, user 2) are changed to-1 at the list item of channel 1, and with list item (user 3, the channel 1) deletion in second tabulation of user-channel;
With reference to 5052: according to the strong jamming table shown in the table 2, the strong jamming of user 3 on channel 1 is from sub-district C, then the edge customer among the C of sub-district (such as user 9) can not busy channel 1, therefore the list item of user in the channel assignment table 9 on channel 1 also is changed to-1, and with list item (user 9, the channel 1) deletion in second tabulation of user-channel;
With reference to 5053: user 3 is positioned at sub-district A, and according to the strong jamming table shown in the table 2, sub-district A does not constitute strong jamming to edge customer 6 and edge customer 9, therefore needn't do further to upgrade to channel assignment table and second tabulation of user-channel.
Through said process, the channel assignment table after the renewal sees Table 4, wherein highlights part and is the list item of this renewal; User-channel second tabulation after the renewal sees Table 5, wherein highlights part and is the list item of this deletion.
Table 4
Table 5
3, at this moment, first list item in second tabulation of user-channel is (user 6, channel 4).Because user-channel second tabulation be empty as yet, therefore refer again to step 505 pair channel assignment table and user-channel second and tabulate and make amendment, upgrade, table 6 and table 7 after obtaining upgrading.Wherein, with reference to 5053, the strong jamming of user 3 on channel 4 be from the sub-district B at user 6 places, and then user 3 can not busy channel 4, therefore the list item of user in the channel assignment table 3 on channel 4 also is changed to-1.
Table 6
Table 7
4, at this moment, first list item in second tabulation of user-channel is (user 9, channel 3).Referring again to second tabulation of step 505 pair channel assignment table and user-channel makes amendment, upgrades, table 8 and table 9 after obtaining upgrading.
Table 8
Table 9
5, at this moment, first list item in second tabulation of user-channel is (user 6, channel 2).Refer again to step 505 pair channel assignment table and make amendment, upgrade, the table 10 after obtaining upgrading.
Table 10
So far, second tabulation of user-channel is for empty, and the combined channel of edge customer distributes end.
Further,, the present invention proposes a kind of method of cell group, to reduce the computation complexity and the signaling consumption of specific implementation for the dynamic syndicated channel assignment scheme based on the user described above is used for real system.
As shown in Figure 6, the network of forming with 19 sub-districts is an example, all sub-districts can be divided into 3 channel allocation groups, wherein organize 1 and group 3 all forms by 9 sub-districts, per 3 cooperation cell are cluster, and are non-conterminous between same group of each interior bunch.Such as, group bunch 1 in 1, bunches 2, bunches 3 is exactly non-conterminous on the geographical position.Consider that the distance between each channel allocation group is far away, make that the interference between each channel allocation group can be ignored, therefore between the sub-district of different channels assign group, do not need to carry out Signalling exchange or only need a spot of Signalling exchange.After carrying out cell group according to said method, determine the dispatching sequence of channel allocation group again, group is carried out dynamic syndicated channel allocation one by one.Need to prove that the channel allocation in each group can be with reference to figure 3-method shown in Figure 5.
Dispatching sequence with " group 1-group 3-group 2 " be an example, and group 1 uses four steps shown in Figure 3 to carry out after dynamics of channels distributes, and notifies the allocation result of its edge customer of other group (promptly organize 3 and organize 2); According to the allocation result of group 1, group 3 is carried out the initialization setting of channel assignment table earlier, the channel allocation in organizing again; Subsequently, the channel allocation in group 2 carries out self organizing according to the allocation result of group 1 and group 3.
For fear of the influence of cell group, can use dispatching sequence between different groups constantly in different scheduling, to guarantee the fairness between each group to the estate performance of each channel allocation group.Such as, when dispatching, above-mentioned dispatching sequence being changed to " group 3-group 2-group 1 " next time, the order when next time dispatching again changes to " group 2-group 1-group 3 ".
Need to prove that the dispatching sequence of each channel allocation group can be that network is default, also can dynamically adjust according to the actual loading of sub-district in each group in the network.Such as, if the load of a sub-district is heavier, or its edge customer number is too much, channel allocation group that just can this place, sub-district of priority scheduling.
With method of the present invention accordingly, Fig. 7 provides the system construction drawing of channel allocation in the first embodiment of the invention.This channel assigning system comprises: one or more serving BS, each serving BS are used for administering one or more user terminal of a sub-district; And, one or more centralized control unit, each centralized control unit is used to administer one or more sub-district.
Wherein, each serving BS is further used for the user terminal in the administration sub-district is divided into central user and edge customer, and by the central user in the administration sub-district carry out channel allocation.
Each centralized control unit be further used for by all edge customers in the administration sub-district carry out combined channel and distribute.
Further, described user terminal is used for the large scale decline feedback information of self is given the serving BS of this user terminal of administration;
Described serving BS is used for determining according to large scale decline information the user type of this user terminal, if this user terminal to the decline of the large scale of serving BS and to the difference of the large scale decline of strong jamming base station greater than default thresholding, determine that then this user terminal is a central user, otherwise determine that this user terminal is an edge customer.
Further, described serving BS is used for:
Determine the first user dispatching sequence of one or more central user in this sub-district, arrange the corresponding relation of central user and channel according to the described first user dispatching sequence;
Determine the current corresponding relation that comes at first points among the described first user dispatching sequence first central user and first channel, obtain the number of busy channel of described first central user, judge whether to surpass the central user maximum channel number, if surpass then this first central user is deleted from the described first user dispatching sequence;
Otherwise, give described first central user with described first channel allocation, again this first channel is deleted from the described first user dispatching sequence, and other user in this sub-district is set to take described first channel.
Further, described centralized control unit is used for:
Receive the SINR of all edge customers of the serving base stations report of its each sub-district of administering, and determine the second user dispatching sequence of one or more edge customer in the sub-district of administering according to described SINR;
Determine the current corresponding relation that comes at first points among the described second user dispatching sequence first edge customer and first channel, obtain the number of busy channel of described first edge customer, judge whether to surpass the edge customer maximum channel number, if surpass then this first edge customer is deleted from the described second user dispatching sequence;
Otherwise, give described first edge customer with described first channel allocation, and be set to take described first channel with other edge customer that described first edge customer has strong jamming relation, other user in this sub-district, first edge customer place also is set to take described first channel, deletes from the described second user dispatching sequence with the corresponding relation of first channel and first edge customer and first channel with the corresponding relation that described first edge customer has other edge customer of strong jamming relation again.
Wherein, other edge customer that has strong jamming relation with described first edge customer comprises: on first channel first edge customer is formed edge customer in the most strongly disturbing sub-district and the most strongly disturbing edge customer that is subjected to sub-district, the first edge customer place on first channel.
As can be seen, in the aforesaid operations, centralized control unit is not that edge customer with all neighbor cells all is set to take first channel, and just the edge customer that has strong jamming relation in the channel assignment table is set to-1 on first channel.
Need to prove that described centralized control unit is arranged on one of them serving BS of one or more sub-district of being administered; Perhaps described centralized control unit is a radio network controller (RNC).
Second embodiment: cell breathing scheme
In the cell breathing scheme of present embodiment, definition has two kinds of different mode of operations: center mode (cell-centre mode, CM) and edge pattern (cell-edge mode, EM).Wherein, center mode is meant that the base station uses lower transmitting power to serve central user; Edge pattern is meant that the base station uses higher transmitting power to serve edge customer.Consider the design feature of hexagon cellular cell, can be divided into three time slots each seeervice cycle of all sub-districts,, can avoid the strong jamming of minizone by the mode of operation of each sub-district of reasonable distribution at each time slot.Each sub-district or be operated in center mode, or be operated in edge pattern.And different districts will satisfy certain constraints according to its position relation each other being provided with also of mode of operation.Such as, neighbor cell cannot be operated in edge pattern simultaneously.
When specific implementation, the basic distribution principle of the mode of operation of a plurality of sub-districts comprises:
1, same sub-district is distributed in the mode of operation of different time-gap: each sub-district has two time slots to be operated in center mode in each seeervice cycle, and a time slot is operated in edge pattern.
2, different districts distributes in the mode of operation of same time slot: if certain sub-district is operated in edge pattern at certain time slot, then its all neighbor cell all must operate at center mode at this time slot; In other words, have only when all neighbor cells of certain sub-district all are operated in center mode, this sub-district just can be operated in edge pattern.
According to above basic distribution principle, for the cellular network of being made up of 19 sub-districts, a kind of allocative decision of feasible mode of operation as shown in Figure 8.Allocative decision according to this three time slots, each sub-district can guarantee in a seeervice cycle, central user of self and edge customer all can obtain effective service, and the whole system strong jamming that do not exist the edge customer by neighbor cell to influence each other and cause.
For the cellular network of minute sector, basic distribution principle above-mentioned also is feasible.Being divided into 3 sectors with each sub-district is example, the allocative decision of mode of operation as shown in Figure 9, same sub-district has only a sector to be in edge pattern at same time slot.
Mode of operation for the out-of-shape sub-district is distributed, can be with reference to " the four look theories " of graph theory in the prior art.As shown in figure 10, carry out painted to a plurality of arbitrary shapes sub-district, make that the sub-district with same color is non-conterminous on the geographical position, then will satisfy this requirement and use 4 kinds of colors at most that these 4 kinds of colors are represented with label 1-4 respectively in Figure 10 according to " four look theories ".Correspondingly, every kind of color is corresponding to the edge pattern of a time slot.That is to say, use four time slots can finish at most all edge customers in the cellular network and the service of central user.
Further, dynamic power management mechanism can also be joined in the cell breathing scheme.Full power transmissions can be used in the base station that works in edge pattern; The base station that works in center mode dynamically determines transmitting power according to the actual loading in the sub-district.When the sub-district internal burden was heavier, the transmitting power of base station in the time of can suitably increasing center mode was to guarantee the service quality of central user; When cell load was light, the transmitting power of base station in the time of can reducing center mode was to alleviate the interference of central user to neighbor cell.The power control of each sub-district can be carried out independently of each other according to the load in each sub-district, to reduce the load of air interface between the base station; Also can carry out a spot of information interaction, cause presence of intercell interference too serious with the transmitting power of avoiding excessive increase center mode of neighbor cell while.
As can be seen, in method for channel allocation of the present invention, determine the user dispatching sequence by using user-channel list, can obtain frequency diversity and user diversity, and improve the total throughout of system based on user's dynamic syndicated channel assignment scheme; Distribute by using channel assignment table to carry out combined channel, thereby avoid the strong jamming of minizone as edge customer.Further, divided into groups and determine dispatching sequence between group in a plurality of sub-districts in the network, when not influencing systematic function, greatly reduce the complexity of interference coordination.
For the cell breathing scheme, by the mode of operation of each sub-district in the reasonable arrangement network, reach the purpose of Inter-Cell Interference Coordination, and obtain higher frequency diversity at each time slot.Further, after the mode of operation of each sub-district is determined, can use the method for channel allocation of various single sub-districts to carry out the channel allocation sub-district in, with the optimization of realization systematic function.
Below adopt the system emulation parameter shown in the table 11, dynamic syndicated channel assignment scheme and cell breathing scheme are carried out performance simulation respectively.
The system emulation parameter of sub-district more than the table 11
For dynamic syndicated channel assignment scheme, its simulation result sees Table 12 and Figure 10,11,12.By relatively finding out, can obtain higher sub-district average throughput based on user's dynamic syndicated channel assignment scheme with the simulation result of other scheme.And along with the raising of central user and edge customer power ratio β, the performance that differs from 5% user most will be better than traditional FFR and SFR scheme gradually.
The simulation result of the dynamic syndicated channel assignment scheme of table 12
For the cell breathing scheme, its simulation result sees Table 13 and Figure 13,14,15.By relatively finding out with the simulation result of other scheme, the cell breathing scheme can significantly improve the performance of edge customer under the prerequisite of the sector average throughput that influences system hardly.Simultaneously, this cell breathing scheme does not need the channel condition information of exchangeing subscriber between the base station, has therefore reduced the load of air interface between the base station effectively.
Need to prove that the β in the table 12 and 13 represents the ratio of base station to central user and the employed transmitting power of edge customer.
The simulation result of table 13 cell breathing scheme
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (25)
1. the method for channel allocation in the wireless communication system, this wireless communication system comprises a plurality of sub-districts, it is characterized in that, this method comprises:
The serving BS of each sub-district is divided into central user and edge customer with its user terminal of administering;
Be provided for administering the centralized control unit of an above sub-district, the serving BS of each sub-district carries out channel allocation to the central user in this sub-district, and described centralized control unit carries out combined channel to all edge customers in the administration sub-district and distributes.
2. method according to claim 1 is characterized in that, its user terminal of administering is divided into central user to the serving BS of described each sub-district and edge customer comprises:
Described serving BS receives the large scale decline information of its user terminal to send up of administering, and determines the user type of this user terminal according to described large scale decline information;
If this user terminal to the decline of the large scale of serving BS and to the difference of the large scale decline of strong jamming base station greater than default thresholding, determine that then this user terminal is a central user, otherwise definite this user terminal is an edge customer.
3. method according to claim 1 is characterized in that, the serving BS of described each sub-district carries out channel allocation to the central user in this sub-district and comprises:
A1, described serving BS are determined the first user dispatching sequence of one or more central user in this sub-district, arrange the corresponding relation of central user and channel according to the described first user dispatching sequence;
A2, determine the current corresponding relation that comes at first points among the described first user dispatching sequence first central user and first channel, obtain the number of busy channel of described first central user, judge whether to surpass the central user maximum channel number, if surpass then this first central user is deleted from the described first user dispatching sequence;
A3 otherwise, give described first central user with described first channel allocation, again this first channel is deleted from the described first user dispatching sequence, and other user in this sub-district is set to take described first channel.
4. method according to claim 3, it is characterized in that, described steps A 1 comprises: for this sub-district is provided with first tabulation of user-channel, determine gain or the fairness parameter of all central user on all channels in this sub-district, it is right to arrange corresponding user-channel according to described gain or fairness parameter descending ground, and described user-channel is recorded in putting in order according to this in described user-channel first tabulation;
Then steps A 2 described this first central user is deleted from the described first user dispatching sequence comprise: with all user-channels of the described first central user correspondence to deletion from described user-channel first tabulation;
Steps A 3 described this first channel is deleted from the described first user dispatching sequence comprise: with all user-channels of the described first channel correspondence to deletion from described user-channel first tabulation.
5. according to claim 3 or 4 described methods, it is characterized in that, the serving BS of described each sub-district carries out channel allocation to the central user in this sub-district and further comprises: after steps A 3, further determine first central user that the current corresponding relation that comes at first points among the described first user dispatching sequence, the Signal to Interference plus Noise Ratio SINR and the default thresholding that obtain this first central user compare, if be lower than described default thresholding then finish channel allocation, otherwise return execution in step A2 to central user in this sub-district.
6. method according to claim 5 is characterized in that, further comprises: after the channel allocation of central user finished, described serving BS sent to the situation of the edge customer in this sub-district on available channel the centralized control unit of this sub-district of administration.
7. method according to claim 1 is characterized in that, described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district and comprises:
B1, this centralized control unit receive the SINR of all edge customers of the serving base stations report of its each sub-district of administering, and determine the second user dispatching sequence of one or more edge customer in the sub-district of administering according to described SINR, arrange the corresponding relation of edge customer and channel according to the described second user dispatching sequence;
B2, determine the current corresponding relation that comes at first points among the described second user dispatching sequence first edge customer and first channel, obtain the number of busy channel of described first edge customer, judge whether to surpass the edge customer maximum channel number, if surpass then this first edge customer is deleted from the described second user dispatching sequence;
B3 otherwise, give described first edge customer with described first channel allocation, and be set to take described first channel with other edge customer that first edge customer has strong jamming relation, other user in this sub-district, first edge customer place also is set to take described first channel, deletes from the described second user dispatching sequence with the corresponding relation of first channel and first edge customer and first channel with the corresponding relation that described first edge customer has other edge customer of strong jamming relation again.
8. method according to claim 7, it is characterized in that, other edge customer that described and first edge customer have strong jamming relation comprises: on first channel first edge customer is formed edge customer in the most strongly disturbing sub-district and the most strongly disturbing edge customer that is subjected to sub-district, the first edge customer place on first channel.
9. method according to claim 7, it is characterized in that, described step B 1 comprises: described centralized control unit is provided with second tabulation of user-channel, gain or the fairness parameter of edge customer on all available channels in all sub-districts of determining to be administered, it is right to arrange corresponding user-channel according to described gain or fairness parameter descending ground, and described user-channel is recorded in putting in order according to this in described user-channel second tabulation;
Then described this first edge customer is deleted from the described second user dispatching sequence of step B2 comprises: with all user-channels of the described first edge customer correspondence to deletion from described user-channel second tabulation.
10. method according to claim 7 is characterized in that, further comprises:
Described centralized control unit receives the strong jamming cell number of all edge customers of the serving base stations report of its each sub-district of administering, generates strong jamming table;
Other edge customer that has strong jamming relation with first edge customer among the then described step B3 is set to take described first channel and comprises:
Determine the strong jamming sub-district of described first edge customer on described first channel according to described strong jamming table, all edge customers in this strong jamming sub-district are set to take described first channel;
Determine that according to described strong jamming table by the most strongly disturbing edge customer in described first sub-district, edge customer place, the most strongly disturbing edge customer of described quilt is set to take described first channel on described first channel.
11. each described method according to Claim 8-10, it is characterized in that, described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district and further comprises: after step B3, judge whether described user-channel second tabulation is empty, if, otherwise return execution in step B2 for empty then finish the combined channel of edge customer is distributed.
12. according to each described method of claim 7-10, it is characterized in that, further comprise: after the combined channel of edge customer distributed end, described centralized control unit sent to the channel allocation situation of edge customer the serving BS of respective cell.
13. method according to claim 1, it is characterized in that, further comprise: after the serving BS of each sub-district carries out channel allocation to the central user in this sub-district, the situation of edge customer in this sub-district on available channel sent to the centralized control unit of this sub-district of administration, described centralized control unit carries out combined channel to all edge customers in the administration sub-district and distributes according to the situation of described edge customer on available channel;
Perhaps, after described centralized control unit carries out the combined channel distribution to all edge customers in the administration sub-district, the channel allocation situation of edge customer is sent to the serving BS of respective cell, the serving BS of each sub-district carries out channel allocation according to the channel allocation situation of described edge customer to the central user in this sub-district.
14. method according to claim 1, it is characterized in that, further comprise: a plurality of microzonations that comprise in the described wireless communication system are assigned in one or more channel allocation groups all sub-districts in channel allocation group of each centralized control unit administration.
15. according to claim 14 described methods, it is characterized in that, further comprise: described one or more channel allocation groups are distributed according to the combined channel that dispatching sequence between the group that sets in advance carries out edge customer, put in order formerly channel allocation group after channel allocation finishes, the channel allocation situation of its edge customer is sent to other channel allocation group.
16. method according to claim 1, it is characterized in that, further comprise: after the combined channel of the channel allocation of central user and edge customer distributed, each serving BS was determined the residue channel of self sub-district, and it is distributed to the central user of this sub-district.
17. method according to claim 16 is characterized in that, the residue channel that described each serving BS is determined self sub-district comprises: described serving BS is searched as yet not by the available channel of the CU in this sub-district; Perhaps
Described serving BS is searched in this sub-district, and the busy channel number is released to the residue channel less than the edge customer of edge customer minimum channel number with all channels of distributing to this edge customer.
18. the method for channel allocation in the wireless communication system is characterized in that, comprising:
The serving BS of each sub-district is divided into central user and edge customer with its user terminal of administering, and corresponding mode of operation is set;
Position relation according to a plurality of sub-districts in the wireless communication system is provided with the mode of operation of each sub-district at each channel;
The serving BS of each sub-district provides communication according to set mode of operation for user terminal on the channel that is distributed.
19. method according to claim 18 is characterized in that, described position relation according to a plurality of sub-districts in the wireless communication system is provided with each sub-district and comprises in the mode of operation of each channel:
Each seeervice cycle of each sub-district is divided into four time slots at the most, and this sub-district mode of operation of a time slot therein is set to edge pattern, is set to center mode in the mode of operation of other time slot; Wherein, under described center mode, the base station uses low transmitting power to serve central user; Under described edge pattern, the base station uses high transmit power to serve edge customer;
In same time slot, a sub-district is set to edge pattern, and its all neighbor cells are set to center mode.
20. method according to claim 18, it is characterized in that, described position relation according to a plurality of sub-districts in the wireless communication system is provided with each sub-district and comprises in the mode of operation of each channel: each microzonation is divided into three sectors, same sub-district has only a sector to be in edge pattern at same time slot, and other sector is in center mode; Wherein, under described center mode, the base station uses low transmitting power to serve central user; Under described edge pattern, the base station uses high transmit power to serve edge customer.
21. a channel assigning system is characterized in that, comprising:
One or more serving BS, each serving BS are used for administering one or more user terminal of a sub-district;
One or more centralized control unit, each centralized control unit is used to administer one or more sub-district;
Described serving BS is further used for the user terminal in the administration sub-district is divided into central user and edge customer, and by the central user in the administration sub-district carry out channel allocation;
Described centralized control unit be further used for by all edge customers in the administration sub-district carry out combined channel and distribute.
22. system according to claim 21 is characterized in that, described user terminal is used for the large scale decline feedback information of self is given the serving BS of this user terminal of administration;
Described serving BS is used for determining according to large scale decline information the user type of this user terminal, if this user terminal to the decline of the large scale of serving BS and to the difference of the large scale decline of strong jamming base station greater than default thresholding, determine that then this user terminal is a central user, otherwise determine that this user terminal is an edge customer.
23. system according to claim 21 is characterized in that, described serving BS is used for:
Determine the first user dispatching sequence of one or more central user in this sub-district, arrange the corresponding relation of central user and channel according to the described first user dispatching sequence;
Determine the current corresponding relation that comes at first points among the described first user dispatching sequence first central user and first channel, obtain the number of busy channel of described first central user, judge whether to surpass the central user maximum channel number, if surpass then this first central user is deleted from the described first user dispatching sequence;
Otherwise, give described first central user with described first channel allocation, again this first channel is deleted from the described first user dispatching sequence, and other user in this sub-district is set to take described first channel.
24. system according to claim 21 is characterized in that, described centralized control unit is used for:
Receive the SINR of all edge customers of the serving base stations report of its each sub-district of administering, and determine the second user dispatching sequence of one or more edge customer in the sub-district of administering according to described SINR, arrange the corresponding relation of edge customer and channel according to the described second user dispatching sequence;
Determine the current corresponding relation that comes at first points among the described second user dispatching sequence first edge customer and first channel, obtain the number of busy channel of described first edge customer, judge whether to surpass the edge customer maximum channel number, if surpass then this first edge customer is deleted from the described second user dispatching sequence;
Otherwise, give described first edge customer with described first channel allocation, and be set to take described first channel with other edge customer that first edge customer has strong jamming relation, other user in this sub-district, first edge customer place also is set to take described first channel, deletes from the described second user dispatching sequence with the corresponding relation of first channel and first edge customer and first channel with the corresponding relation that described first edge customer has other edge customer of strong jamming relation again.
25., it is characterized in that described centralized control unit is arranged on one of them serving BS of one or more sub-district of being administered according to each described system of claim 21-24; Perhaps
Described centralized control unit is a radio network controller (RNC).
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| CN102857923A (en) * | 2011-06-29 | 2013-01-02 | 普天信息技术研究院有限公司 | Uplink interference coordination combined power control method among communities |
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| CN103079277A (en) * | 2011-10-25 | 2013-05-01 | 中兴通讯股份有限公司 | Resource scheduling and distributing method and system in orthogonal frequency division multiplexing system |
| CN103079215A (en) * | 2012-12-28 | 2013-05-01 | 华中科技大学 | Multi-cell combined optimization method on basis of sector fairness |
| CN103079215B (en) * | 2012-12-28 | 2015-04-15 | 华中科技大学 | Multi-cell combined optimization method on basis of sector fairness |
| CN103906069A (en) * | 2014-02-25 | 2014-07-02 | 北京邮电大学 | Channel borrowing method |
| CN103906069B (en) * | 2014-02-25 | 2019-07-09 | 北京邮电大学 | Channel method |
| CN105207759A (en) * | 2015-08-14 | 2015-12-30 | 清华大学 | Pilot frequency multiplexing method with multiplexing factor of 4 in super-dense networking |
| CN106341884A (en) * | 2016-08-24 | 2017-01-18 | 重庆大学 | User location updating method and user location update device |
Also Published As
| Publication number | Publication date |
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| JP2011055497A (en) | 2011-03-17 |
| CN101998650B (en) | 2014-11-05 |
| JP5638880B2 (en) | 2014-12-10 |
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