CN102186247B - Method and system for coordinating interference between cells - Google Patents
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Abstract
The invention discloses a method and a system for coordinating interference between cells. The method is suitable for an interference coordinating process which is triggered after an interfered cell detects the interference from an interference cell, wherein a first base station for providing service for the interfered cell provides a first load indication message carrying resource distributing information needed by interfered users in the interfered cell for a second base station for providing the service to the interference cell; the second base station configures almost blank subframe (ABS) information including frequency domain information for the interference cell according to the received resource distributing information, the ABS information is sent to the first base station through a second load indication message; the second base station configures the corresponding ABS for the interference cell according to the ABS information; and the first base station dispatches the interfered users to a frequency domain resource corresponding to the ABS of the interference cell to receive the data according to the frequency domain information of the ABS. When the technical scheme of the invention is used, the loss of the system capacity in the interference coordinating process is reduced.
Description
Technical field
The present invention relates to the network communications technology, particularly a kind of method and system of Inter-Cell Interference Coordination.
Background technology
Long Term Evolution (LTE, Long Term Evolution) system adopts flat network configuration.Fig. 1 is the LTE network structure.As shown in Figure 1, the radio access network of universal mobile communication system of evolution (E UTRAN, Evolved Universal Terrestrial Radio Access Network) formed by base station (eNB, evolved NodeB), between eNB, by X2 interface, transmit related news; Evolved Packet Core (Evolved Packet Corenet work, EPC) comprise gateway (S GW, Serving Gateway) and Mobility Management Entity (MME, Mobility Management Entity), mutual by S1 interface and eNB.Wherein each eNB comprises a plurality of communities.
In the LTE communication system, strengthen Inter-Cell Interference Coordination (eICIC) for be the dl interference in heterogeneous network community Macro Pico and two kinds of scenes of Macro Femto.The method adopted is to reduce descending presence of intercell interference by time division multiplexing (TDM) and power control.The TDM method is the only resource of Macro Pico scene, is also the Main Means of Macro Femto scene simultaneously.
The TDM method is based on the information interaction between interfered cell and interfered cell, in interfered cell, its part subframe of configuration is similar gap frame (ABS, Almost Blank Subframe), then dispatch being disturbed on user's running time-frequency resource corresponding to the ABS subframe with interfered cell in interfered cell and accept data, to reduce interference.Except the necessary signal such as reference signal, no longer transmit any business datum in described ABS subframe, be similar to empty subframe.The ABS sub-frame frequency occupies the whole system bandwidth on territory, on time-domain, according to interfere information and available resources situation, configures.
Fig. 2 is interference coordination schematic diagram of the prior art; As shown in Figure 2, interfered cell has configured the ABS subframe, when interfered cell, dispatches when its UE is used under the running time-frequency resource corresponding with the ABS subframe of interfered cell configuration the reception data and is subject to less interference.
In prior art, the ABS sub-frame configuration has following requirement:
The pattern of ABS configuration periodically upgrades.The FDD cycle is 40ms, and TDD, according to uplink-downlink configuration different cycles difference, configures 1～5 for 20ms, configures 0 for 70ms, configures 6 for 60ms.
Consider uplink hybrid automatic repeat request HARQ regularly, the FDD cycle is 8ms, i.e. ABS subframe of every 8 sub-frame configuration; The Typical Disposition in TDD cycle is 10ms, i.e. ABS subframe of every 10 sub-frame configuration.
Like this, the minimum capacity loss of interfered cell is also that the minimum resource allocation unit of ABS configuration is as follows respectively simultaneously:
An ABS subframe of every 40ms configuration in FDD, interfered cell will reduce the capacity of (1/40) * 100%=2.5%.When considering ascending HARQ requirement regularly, the every 8ms of FDD must configure an ABS subframe, interfered cell capacitance loss (1/8) * 100%=12.5.
An ABS subframe of TDD configuration 1～510ms configuration, capacitance loss 10%; Configuration 0 and configuration 6 are respectively (1/70) * 100%=1.43% and (1/60) * 100%=1.67%.When considering that ascending HARQ regularly requires, the capacitance loss of TDD Typical Disposition is (1/10) * 100%=10%
This has been the least unit of Resources allocation, but this least unit can not meet the resource requirement that is subject to dry user, and the distribution of Radio Resource can be arrived the RB one-level, compares the such allocation unit of ABS subframe of Whole frequency band, and both differ very large.Such as a kind of situation, when the resource that is disturbed user's needs is less than an allocation unit, the capacity that interfered cell reduces can not be made up fully; When 1.5 units of needs, if distribute 1 unit, can not meet the demand of interference coordination for another example, if distribute 2 units, waste 0.5 unit.Consider that actual conditions can be more complicated, such as Macro covers a plurality of Pico and Femto community, what configure a plurality of abs modes may wait situation, according to the scale of current this Resources allocation, all will cause the wasting of resources, affects the capacity of total system.
Summary of the invention
The invention discloses a kind of method of Inter-Cell Interference Coordination, the method can the reduce disturbance coordination process in the loss of power system capacity.
For achieving the above object, the method is achieved in that
A kind of method of Inter-Cell Interference Coordination, the method is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected, what wherein provide service for interfered cell is the first base station, and what provide service for interfered cell is the second base station, and the method comprises:
The first base station sends the first load Indication message to the second base station; Carry in interfered cell and be disturbed the required resource allocation information of user in this first load Indication message;
The second base station is according in the interfered cell of carrying in the first load Indication message, being disturbed the needed resource allocation information of user, for interfered cell configures similar gap frame ABS information, by the second load Indication message, this ABS information is sent to the first base station; Wherein in ABS information, carry the ABS subframe that comprises frequency domain information;
The second base station is according to configured ABS information, for interfered cell configures corresponding ABS subframe;
The first base station is according to the ABS subframe that comprises frequency domain information in the ABS information received, and the user that is disturbed in interfered cell is dispatched under the frequency domain resource corresponding with the ABS subframe of interfered cell and receives data.
The invention also discloses a kind of system of Inter-Cell Interference Coordination, this system can the reduce disturbance coordination process in the loss of power system capacity.
For achieving the above object, the method is achieved in that
A kind of system of Inter-Cell Interference Coordination, this system is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected, what wherein provide service for interfered cell is the first base station, and what provide service for interfered cell is the second base station, and this system comprises:
The first base station, send to the second base station for by the first load Indication message, interfered cell being disturbed to the required resource allocation information of user; The the second load Indication message sent for receiving the second base station, according to the ABS subframe that comprises frequency domain information in the ABS information of carrying in the second load Indication message, the user that is disturbed in interfered cell is dispatched under the corresponding frequency domain resource of ABS subframe with interfered cell and receives data;
The second base station, for receiving the first load Indication message that interfered cell is disturbed the required resource allocation information of user that carries of the first base station transmission, ABS information in local configuration packet containing the ABS subframe of frequency domain information, cross the second load Indication message by this ABS information exchange and send to the first base station; For according to configured ABS information, configuring corresponding ABS subframe on interfered cell.
In sum, technical scheme of the present invention is by adopt the resource distribution mode of time domain and frequency domain combination simultaneously, the ABS subframe configured in the present invention can only take the part frequency domain resource, make frequency domain resource distribute and reach Physical Resource Block PRB level, reduce because of the excessive system capacity loss caused of resource allocation unit.
The accompanying drawing explanation
Fig. 1 is the LTE network structure;
Fig. 2 is interference coordination schematic diagram of the prior art;
Fig. 3 is the flow chart of a kind of method of Inter-Cell Interference Coordination in the present invention;
Fig. 4 is the signaling process figure of the method for a kind of Inter-Cell Interference Coordination in the present invention;
Fig. 5 is the schematic diagram that the subframe of use part frequency domain in the present invention is carried out interference coordination;
Fig. 6 is the structural representation of a kind of system of Inter-Cell Interference Coordination in the present invention.
Embodiment
The invention discloses a kind of method and system of Inter-Cell Interference Coordination, technical scheme of the present invention is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected, what wherein provide service for interfered cell is the first base station, and what provide service for interfered cell is the second base station; Technical scheme of the present invention can the reduce disturbance coordination process in the loss of power system capacity.
Fig. 3 is the flow chart of a kind of method of Inter-Cell Interference Coordination in the present invention.As shown in Figure 3,
In order to make the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, describe the present invention.
Fig. 4 is the signaling process figure of the method for a kind of Inter-Cell Interference Coordination in the present invention.Wherein, what provide service for interfered cell is the first base station, and what provide service for interfered cell is the second base station; As shown in Figure 4,
Step 401, the first base station sends the first load Indication message LOAD INFORMATION to the second base station, be disturbed the needed resource allocation information of user carry interfered cell in this first load Indication message in.The size that comprises in interfered cell the required radio resource requirements amount that is disturbed the user in described resource allocation information, can be specially and need how many minimum resource allocation unit; Described resources requirement is determined by the traffic carrying capacity size that is disturbed the user.
Step 402, the second base station receives the first load Indication message that the first base station sends, and according in the interfered cell of carrying in this first load Indication message, being disturbed the needed resource allocation information of user, is interfered cell configuration ABS information; The described ABS information exchange configured is crossed to the second load Indication message and send the first base station.Described ABS information comprises: the cycle of abs mode; Need the ABS number of subframes of configuration in each cycle, and the position that needs the ABS subframe of configuration in each cycle; The frequency domain information of each ABS subframe.
In this step 402, the frequency domain information that comprises each ABS subframe in ABS information is specially: the corresponding vacant PRB information of configuration in ABS information, indicate the frequency domain resource information in corresponding ABS subframe.If the ABS subframe is used the resource of full frequency-domain, whole frequency domain resource of vacant this subframe of PRB information indicating can be used; If the ABS subframe is used the resource of part frequency domain, the part frequency domain resource of vacant this subframe of PRB information indicating can be used.Described vacant PRB information is a bit map; The corresponding PRB of each bit in this bit map, the value of the bit in this bit map is for meaning the use state of the PRB that this bit is corresponding.
In an embodiment of the present invention, described vacant PRB information is that a maximum is 110 bit map.The PRB that in this bit map, each bit is corresponding can be expressed as: PRB0, and PRB1 ... PRB109.
The value of the bit in this bit map is 1 o'clock, means that the corresponding PRB of this bit is idle condition, when the value of bit is 0, means that the corresponding PRB of this bit is busy state; Perhaps the value of the bit in bit map is 0 o'clock, means that the corresponding PRB of this bit is idle condition, when the value of bit is 1, means that the corresponding PRB of this bit is busy state.
Step 403, the second base station is according to described ABS information, for interfered cell configures corresponding ABS subframe.
In step 403, described interfered cell configures corresponding ABS subframe and is specially: the second base station configures and meets the ABS subframe that is disturbed the required respective numbers of user in interfered cell in the first base station on interfered cell, if the ABS subframe that only needs to use the component frequency resource is arranged in required ABS subframe,, by the vacant PRB information of configuration, the vacant PRB of required expression component frequency resource is configured in the vacant PRB information in ABS information.
Step 404, the first base station receives the second load Indication message that the second base station sends, according to the ABS subframe that comprises frequency domain information of carrying in the ABS information of this second load in Indication message, the user that is disturbed in interfered cell is dispatched under the frequency domain resource corresponding with the ABS subframe of interfered cell and receives data.
In step 404, the second base station has arranged and has met the ABS subframe that is disturbed the customer service demand under the first base station in interfered cell in interfered cell, and the first base station is dispatched to reception data or transmission data under frequency domain resource corresponding with the ABS subframe arranged in interfered cell in interfered cell by being disturbed the user in interfered cell.In interfered cell, the suffered interference of user that is disturbed under the frequency domain resource corresponding with the ABS subframe of interfered cell reduces.
Fig. 5 is the schematic diagram that the subframe of use part frequency domain in the present invention is carried out interference coordination; As shown in Figure 5, frequency domain is vacated the component frequency resource for interference coordination, and remainder is still for business data transmission.Be specially the vacant PRB that described component frequency resource is corresponding for being arranged to the ABS subframe, for the interference between coordination and interfered cell.And indicate in the vacant PRB information that described vacant PRB is increased newly in ABS information, the ABS information that this is carried to vacant PRB information sends to second base station at interfered cell place to carry out respective handling.
Table 1 is the definition list that has increased the ABS information after vacant PRB information in the present invention.
Table 1
As shown in table 1, in an embodiment of the present invention, describedly increase vacant PRB information in ABS information, this vacant PRB information is the bit map that maximum is 110; Each in bitmap represents a PRB (first correspondence PRB0, the like), and a certain place value means that for " 1 " corresponding PRB is vacant state, and being worth for " 0 " means corresponding PRB is the non-NULL configuration state.Maximum Physical Resource Block number be 109.
Abs mode in the present invention (ABS Pattern) can be used the ABS subframe of a full rate resource, or uses the ABS subframe of a component frequency.In an embodiment of the present invention, if be disturbed the required resource of user, not an integer minimum resource allocation unit, as 1.5 minimum resource allocation units.Described 1.5 minimum resource allocation units are 1.5 subframes, and, when configuration ABS information, in the cycle of the abs mode configured, it is 2 that the ABS number of subframes that configure is set, and one of them subframe is used full frequency-domain, and another subframe is used the part frequency domain.Be specially:
Under fdd mode, abs mode information is the bit map that length is 40.1.5 subframes of configuration under this pattern, to be configured to 2 bits be 1 to the corresponding bit map of abs mode information, all the other 38 are set to 0.For convenient for example, the 1st subframe and the 9th subframe are set to the ABS subframe, and bit map corresponding to abs mode information is " 100000001000...000 ".The value of bit is that this subframe of 1 expression is the ABS subframe in this embodiment, and the value of bit is the subframe of this subframe of 0 expression for the transmission data.
Corresponding to 2 ABS subframes that configure in abs mode information, 2 vacant PRB information need be set in ABS information; By the 1st and the 9th bit in the difference of the order from a high position to low level corresponding A BS pattern information.Owing to will distributing 1.5 subframes, the 1st the ABS subframe that subframe is full frequency-domain, the 9th the ABS subframe that subframe is the part frequency domain, so in the 1st vacant PRB information, the value of whole bits all is set to 1, in second vacant PRB information, the value of the bit of half is set to 1, for convenient for example, in described bit map, optional 55 are set to 1, all the other 55 are set to 0, the value that the value of the corresponding bit of PRB0～PRB54 is set to 1, PRB55～corresponding bit of PRB109 is set to 0; I.e. " 11111111.....00000000 ".In this embodiment, the value of the bit in bit map is 1 o'clock, means that the corresponding PRB of this bit is vacant state.The ABS information configured is as shown in table 2:
Table 2
In the present invention, while in specific embodiment, carrying out actual deployment, how frequency resource distributes can be determined according to being disturbed the locked resource that the user need to distribute.When being disturbed the user and needing more resource, when increasing ABS subframe time upper density, distribute more multifrequency territory resource such as whole band system band; Less when subscriber traffic, when resource requirement is less than the minimum time resource allocation unit that can configure, the ABS subframe takies the part frequency domain resource.FDD or tdd mode are depended in minimum resource allocation unit, and to whether need ascending HARQ regularly relevant.
The invention provides a kind of system of Inter-Cell Interference Coordination, this system is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected.
Fig. 6 is the structural representation of a kind of system of Inter-Cell Interference Coordination in the present invention; As shown in Figure 6, what provide service for interfered cell is the first base station 601, and what provide service for interfered cell is the second base station 602, wherein:
The first base station 601, send to the second base station 602 for by the first load Indication message, interfered cell being disturbed to the required resource allocation information of user; The the second load Indication message sent for receiving the second base station, according to the ABS subframe that comprises frequency domain information in the ABS information of carrying in the second load Indication message, the user that is disturbed in interfered cell is dispatched under the corresponding frequency domain resource of ABS subframe with interfered cell and receives data;
The second base station 602, for receiving the first load Indication message that interfered cell is disturbed the required resource allocation information of user that carries of the first base station 601 transmissions, ABS information in local configuration packet containing the ABS subframe of frequency domain information, cross the second load Indication message by this ABS information exchange and send to the first base station 601; For according to configured ABS information, configuring corresponding ABS subframe on interfered cell.
In sum, technical scheme of the present invention, by increase the vacant PRB information that means to use the part frequency domain resource in ABS information, is used those PRB by this vacant PRB information indication, avoids in the interference coordination process, distribute too much power system capacity, cause waste; Use the present invention service time and frequency resource simultaneously, time resource distributes traffic carrying capacity and the service period sexual demand that can meet customer service, frequency resource allocation can reduce the resource allocation unit, can reach the PRB level, make resource distribution more flexible, more accurate, reduce the wasting of resources, avoid system capacity loss.
Described is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (6)
1. the method for an Inter-Cell Interference Coordination, it is characterized in that, the method is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected, what wherein provide service for interfered cell is the first base station, what provide service for interfered cell is the second base station, and the method comprises:
The first base station sends the first load Indication message to the second base station; Carry in interfered cell and be disturbed the required resource allocation information of user in this first load Indication message;
The second base station is according in the interfered cell of carrying in the first load Indication message, being disturbed the needed resource allocation information of user, for interfered cell configures similar gap frame ABS information, by the second load Indication message, this ABS information is sent to the first base station; Wherein in ABS information, carry the ABS subframe that comprises frequency domain information;
The second base station is according to configured ABS information, for interfered cell configures corresponding ABS subframe;
The first base station is according to the ABS subframe that comprises frequency domain information in the ABS information received, and the user that is disturbed in interfered cell is dispatched under the frequency domain resource corresponding with the ABS subframe of interfered cell and receives data;
Described ABS information comprises: need the ABS number of subframes configured, the position that needs the ABS subframe of configuration in each cycle in the cycle of abs mode, each cycle, and the frequency domain information of each ABS subframe;
Wherein, the frequency domain information that comprises the ABS subframe in described ABS information comprises: the vacant PRB information increased in the ABS subframe, and for meaning the frequency domain resource of described ABS subframe.
2. method according to claim 1, is characterized in that,
Described vacant PRB information is a bit map; The corresponding PRB of each bit in this bit map, the value of this bit is for meaning the use state of corresponding PRB.
3. method according to claim 2, is characterized in that, the value of described bit is for meaning that the use state of corresponding PRB comprises:
The value of the bit in described bit map is to mean that the corresponding PRB of this bit is idle condition at 1 o'clock, and the value of bit is to mean that the corresponding PRB of this bit is busy state at 0 o'clock;
Perhaps,
The value of the bit in described bit map is to mean that the corresponding PRB of this bit is idle condition at 0 o'clock, and the value of bit is to mean that the corresponding PRB of this bit is busy state at 1 o'clock.
4. the system of an Inter-Cell Interference Coordination, it is characterized in that, this system is applicable to interfered cell and the interference coordination process that the interference from interfered cell triggers afterwards detected, what wherein provide service for interfered cell is the first base station, what provide service for interfered cell is the second base station, and this system comprises:
The first base station, send to the second base station for by the first load Indication message, interfered cell being disturbed to the required resource allocation information of user; The the second load Indication message sent for receiving the second base station, according to the ABS subframe that comprises frequency domain information in the ABS information of carrying in the second load Indication message, the user that is disturbed in interfered cell is dispatched under the corresponding frequency domain resource of ABS subframe with interfered cell and receives data;
The second base station, for receiving the first load Indication message that interfered cell is disturbed the required resource allocation information of user that carries of the first base station transmission, ABS information in local configuration packet containing the ABS subframe of frequency domain information, cross the second load Indication message by this ABS information exchange and send to the first base station; For according to configured ABS information, configuring corresponding ABS subframe on interfered cell;
Described ABS information comprises: need the ABS number of subframes configured, the position that needs the ABS subframe of configuration in each cycle in the cycle of abs mode, each cycle, and the frequency domain information of each ABS subframe;
Wherein, the frequency domain information that comprises the ABS subframe in described ABS information comprises:
The vacant PRB information increased in the ABS subframe, for meaning the frequency domain resource of described ABS subframe.
5. system according to claim 4, is characterized in that, described vacant PRB information is a bit map; The corresponding PRB of each bit in this bit map, the value of this bit is for meaning the use state of corresponding PRB.
6. system according to claim 5, is characterized in that, the value of described bit is for meaning that the use state of corresponding PRB comprises:
The value of the bit in described bit map is to mean that the corresponding PRB of this bit is idle condition at 1 o'clock, and the value of bit is to mean that the corresponding PRB of this bit is busy state at 0 o'clock;
Perhaps,
The value of the bit in described bit map is to mean that the corresponding PRB of this bit is idle condition at 0 o'clock, and the value of bit is to mean that the corresponding PRB of this bit is busy state at 1 o'clock.
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