CN103313410B - A kind of coordinated scheduling method and device - Google Patents

Abstract

The present invention provides a coordinated scheduling method, including: prioritizing the sectors in the baseband pool; taking out the sector with the highest priority, and after allocating resources for terminals in the sector, taking out other sectors in the baseband pool in sequence area, perform the following operations: take out the terminal with the highest priority among the terminals to be scheduled in the current sector, sort the free resource blocks according to the signal quality value obtained by the terminal on each free resource block, take out the free resource blocks in turn, and judge Whether the preset allocation condition is satisfied, if so, allocate the free resource block to the terminal, otherwise, continue to take out the next free resource block for judgment, until the free resource block is allocated for the terminal or all free resources are judged Blocks cannot be allocated to the terminal; and so on, until the scheduling of all terminals to be scheduled in the current sector is completed. The invention also provides a coordination scheduling device.

Description

A method and device for coordinated scheduling

technical field

The present invention relates to the communication field, in particular to a multi-sector coordinated scheduling method and device in an Orthogonal Frequency Division Multiplexing (abbreviated as OFDM) system.

Background technique

Coordinated Multiple Point (COMP) technology means that multiple geographically independent and dispersed transmission points serve multiple terminals through different cooperative methods (such as joint transmission, joint processing, cooperative scheduling, etc.). Among them, the multiple transmission points may be a base station with a complete resource management module, a baseband processing module and a radio frequency unit, or a plurality of radio frequency units and antennas (such as distributed antennas) with different geographic locations, or a relay node. Among them, the cooperative scheduling technology is the easiest to implement. It only needs to share the scheduling allocation information between the cooperating sectors, and does not need to share data information, which saves overhead.

In an Orthogonal Frequency Division Multiplexing (OFDM for short) system, when a base station and different terminals perform downlink data transmission in the same sector, since these downlinks and uplinks are orthogonal to each other, Therefore, intra-sector interference can be avoided. However, the links between different sectors may not be orthogonal, so each terminal may suffer downlink interference from base stations in other adjacent sectors and uplink interference from terminals in other adjacent sectors, namely , inter-sector interference. If the inter-sector interference is severe, the system capacity will be reduced, especially the transmission capability of the terminal at the edge of the sector, thereby affecting the coverage capability of the system and the performance of the terminal. In order to overcome inter-sector interference and ensure a certain bandwidth utilization, time-frequency domain interference coordination technology can be used to allocate different sub-band resources to edge terminals to reduce inter-sector interference intensity.

The interference coordination scheduling method is to allocate different subband resources as the terminals of each other as interference sources, so as to reduce the interference intensity between cells as much as possible, but in the traditional interference coordination scheduling method, for each sector, the edge terminals are simply Terminals that are regarded as mutual interference sources, and the subband resource blocks allocated to edge terminals are fixed, so that while ensuring that edge terminals in adjacent sectors are allocated different subband resource blocks, the gain of frequency selectivity is also lost. And when the load is unbalanced, there is a waste of resources.

Contents of the invention

The technical problem to be solved by the present invention is to provide a coordinated scheduling method and device to achieve inter-sector interference coordination under the premise of using as little signaling overhead as possible and ensuring sector traffic as much as possible to enhance system coverage .

In order to solve the above problems, the present invention provides a coordinated scheduling method, including:

Prioritize the sectors in the baseband pool;

Take out the sector with the highest priority, and after allocating resources for terminals in the sector, take out other sectors in the baseband pool in order of priority from high to low, and perform the following operations for each taken out sector:

According to the scheduling priority, the terminal with the highest priority among the terminals to be scheduled in the current sector is taken out, and the idle resource blocks are sorted according to the signal quality value obtained by the terminal on each idle resource block, in order of signal quality from good to bad Take out a free resource block, and judge whether the preset allocation condition is satisfied, if so, allocate the free resource block to the terminal, otherwise, continue to take out the next free resource block for judgment, until the free resource is allocated to the terminal block or judge that all free resource blocks cannot be allocated to the terminal; and so on, obtain the next terminal to be scheduled in the current sector, and perform resource scheduling until the scheduling of all terminals to be scheduled in the current sector is completed.

Further, the above method may also have the following characteristics, and determine whether the preset allocation conditions are met according to the following method:

Judging when the currently retrieved idle resource block is allocated to the current terminal to be scheduled, whether the interference of the currently unscheduled terminal to each terminal under the baseband pool scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or caused by interference Whether the signal quality degradation is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Further, the above method may also have the following characteristics, and determine whether the preset allocation conditions are met according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is satisfied;

If the current terminal to be scheduled has a cooperative sector, then:

Judging when the currently fetched idle resource block is allocated to the current to-be-scheduled terminal, whether the interference of the current to-be-scheduled terminal to each terminal scheduled on the currently fetched idle resource block by the cooperating sectors is less than or equal to Whether the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Further, the above method may also have the following characteristics, and determine whether the preset allocation conditions are met according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is met;

If the current terminal to be scheduled has a cooperative sector, then:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi meets the following conditions, SectorM is not a cooperative sector of UEi; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to the sector The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold; the preset allocation condition is met; otherwise, the preset allocation condition is not met;

The first specified value indicates that the correlation coefficient between the channel coefficient from UEi to its serving sector Sectori and the channel coefficient to the sector SectorM on the currently retrieved idle resource block is smaller than a given threshold.

Further, the above method may also have the following characteristics, and determine whether the preset allocation conditions are met according to the following method:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi satisfies the following conditions: SectorM is not a cooperative sector of UEi; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently retrieved idle resource block is the same as that to the The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, the preset distribution condition is satisfied; otherwise, the preset distribution condition is not satisfied;

The first specified value indicates that the correlation coefficient between the channel coefficient from UEi to its serving sector Sectori and the channel coefficient to the sector SectorM on the currently retrieved idle resource block is smaller than a given threshold.

Further, the above-mentioned method may also have the following characteristics, judging whether the signal quality degradation caused by the interference of the terminal currently to be scheduled to the terminal scheduled on the currently retrieved idle resource block is less than or equal to the signal quality threshold in the following manner:

Calculating the new signal quality value and the original signal quality value of the terminal scheduled on the currently fetched idle resource block when the currently fetched idle resource block is allocated or not allocated to the terminal to be scheduled, according to the new signal The quality value and the original signal quality value obtain the overall spectrum variation, compare the overall spectrum variation with the preset overall spectrum variation threshold, if it is less than or equal to the overall spectrum variation threshold, the signal quality degradation caused by interference is less than or equal to Signal quality threshold, otherwise, the signal quality degradation caused by interference is greater than the signal quality threshold.

Further, the above method may also have the following characteristics, the signal quality value is an SINR value;

Obtaining the overall spectrum variation according to the new signal quality value and the original signal quality value includes:

Among them, SINR _UE is the original signal quality value, NewSINR _UE is the new signal quality value, and ΔSE _UE is the overall spectrum efficiency change.

Further, the above-mentioned method can also have the following characteristics, and the method also includes:

The serving sector of the terminal compares the modulation and coding set MCS corresponding to the channel quality indicator CQI fed back by the terminal with a given MCS threshold, and if it is smaller than the MCS threshold, it is a far-point edge terminal;

Otherwise, the serving sector of the terminal counts the reference signal received power RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, and compares the difference between the two with the given A predetermined measurement difference threshold, if it is smaller than the measurement difference threshold, the adjacent sector is the cooperative sector of the terminal; if the terminal does not have a cooperative sector, the terminal is an inner ring terminal, otherwise it is a close point edge terminal;

Whether the terminal has a cooperative sector is judged according to the following method: when the terminal is a far-point edge terminal or an inner-ring terminal, there is no cooperative sector; when the terminal is a near-point edge terminal, there is a cooperative sector.

The present invention also provides a coordination scheduling device, including:

The sector sorting unit is used to prioritize the sectors in the baseband pool;

The first scheduling unit is configured to take out the sector with the highest priority and allocate resources for terminals in the sector;

The control unit is configured to, after the first scheduling unit allocates resources to the terminal in the sector with the highest priority, take out other sectors in the baseband pool in order according to the priority from high to low;

The second scheduling unit is configured to perform the following operations on the sector taken out by the control unit:

According to the scheduling priority, the terminal with the highest priority among the terminals to be scheduled in the current sector is taken out, and the idle resource blocks are sorted according to the signal quality value obtained by the terminal on each idle resource block, in order of signal quality from good to bad Take out a free resource block, and judge whether the preset allocation condition is satisfied, if so, allocate the free resource block to the terminal, otherwise, continue to take out the next free resource block for judgment, until the free resource is allocated to the terminal block or judge that all free resource blocks cannot be allocated to the terminal; and so on, obtain the next terminal to be scheduled in the current sector, and perform resource scheduling until the scheduling of all terminals to be scheduled in the current sector is completed.

Further, the above-mentioned device may also have the following characteristics, the second scheduling unit determines whether the preset allocation condition is satisfied according to the following method:

Judging when the currently retrieved idle resource block is allocated to the current terminal to be scheduled, whether the interference of the currently unscheduled terminal to each terminal under the baseband pool scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or caused by interference Whether the signal quality degradation is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Further, the above-mentioned device may also have the following characteristics, the second scheduling unit determines whether the preset allocation condition is satisfied according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is satisfied;

If the current terminal to be scheduled has a cooperative sector, then:

Judging when the currently fetched idle resource block is allocated to the current to-be-scheduled terminal, whether the interference of the current to-be-scheduled terminal to each terminal scheduled on the currently fetched idle resource block by the cooperating sectors is less than or equal to Whether the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Further, the above-mentioned device may also have the following characteristics, the second scheduling unit determines whether the preset allocation condition is satisfied according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is satisfied;

If the current terminal to be scheduled has a cooperative sector, then:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi all satisfies the following conditions: SectorM is not a cooperative sector of UEi; The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold; the preset allocation condition is met; otherwise, the preset allocation condition is not met;

The first specified value indicates that the correlation coefficient between the channel coefficient from UEi to its serving sector Sectori and the channel coefficient to the sector SectorM on the currently retrieved idle resource block is smaller than a given threshold.

Further, the above-mentioned device may also have the following characteristics, the second scheduling unit determines whether the preset allocation condition is satisfied according to the following method:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi satisfies the following conditions: SectorM is not a cooperative sector of UEi; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently retrieved idle resource block is the same as that to the The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, the preset distribution condition is satisfied; otherwise, the preset distribution condition is not satisfied;

The first specified value indicates that the correlation coefficient between the channel coefficient from UEi to its serving sector Sectori and the channel coefficient to the sector SectorM on the currently retrieved idle resource block is smaller than a given threshold.

Further, the above-mentioned device may also have the following feature, the second scheduling unit judges whether the signal quality degradation caused by the interference of the terminal currently to be scheduled to the terminal scheduled on the currently retrieved idle resource block is less than or equal to the signal quality threshold in the following manner :

Calculating the new signal quality value and the original signal quality value of the terminal scheduled on the currently fetched idle resource block when the currently fetched idle resource block is allocated or not allocated to the terminal to be scheduled, according to the new signal The quality value and the original signal quality value obtain the overall spectrum variation, compare the overall spectrum variation with the preset overall spectrum variation threshold, if it is less than or equal to the overall spectrum variation threshold, the signal quality degradation caused by interference is less than or equal to Signal quality threshold, otherwise, the signal quality degradation caused by interference is greater than the signal quality threshold.

Further, the above-mentioned device may also have the following characteristics, the signal quality value is an SINR value;

The acquisition of the overall spectrum variation by the second scheduling unit according to the new signal quality value and the original signal quality value includes:

Among them, SINR _UE is the original signal quality value, NewSINR _UE is the new signal quality value, and ΔSE _UE is the overall spectrum efficiency change.

Further, the above-mentioned device may also have the following features, the device also includes a terminal type determining unit, configured to compare the modulation and coding set MCS corresponding to the channel quality indicator CQI fed back by the terminal with a given MCS threshold, and if it is smaller than the If the MCS threshold is the far-point edge terminal; otherwise, count the reference signal received power RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, and compare the relationship between the two If the difference and a given measurement difference threshold are smaller than the measurement difference threshold, the adjacent sector is the cooperative sector of the terminal; if the terminal does not have a cooperative sector, the terminal is an inner ring terminal, Otherwise, the near-point edge terminal;

The second scheduling unit determines whether the terminal has a cooperative sector according to the terminal type. When the terminal is a far point edge terminal or an inner ring terminal, there is no cooperative sector, and when the terminal is a near point edge terminal, there is a cooperative sector.

Through the present invention, the interference can be estimated, and on the premise of ensuring that the terminals in the sector with high priority are allocated to the optimal resource block, as far as possible, the terminals with strong mutual interference among the cooperative sectors are allocated to different resource blocks. Frequency subband resources to achieve interference coordination, improve the overall spectrum efficiency and the spectrum efficiency of edge terminals.

Description of drawings

Fig. 1 is the overall flowchart according to embodiment 1 of the present invention;

FIG. 2 is a specific flow chart of sector S2 scheduling according to Embodiment 1 of the present invention;

FIG. 3 is a specific flowchart of sector S1 scheduling according to Embodiment 1 of the present invention;

Fig. 4 is a specific flow chart of determining and scheduling RBs for the currently scheduled user in sector S1 according to Embodiment 1 of the present invention;

FIG. 5 is an overall flow chart according to Embodiment 2 of the present invention;

FIG. 6 is a specific flow chart of sector S2 scheduling according to Embodiment 2 of the present invention;

FIG. 7 is a specific flow chart of sector S1 scheduling according to Embodiment 2 of the present invention;

Fig. 8 is a block diagram of a coordination scheduling device according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Since the total transmit power of the terminal has an upper limit, the more transmit antennas the terminal has, the smaller the average transmit power of each transmit antenna is, so the terminal can use more power when using a single antenna to transmit than when multiple antennas transmit In order to enhance the coverage of the uplink system as much as possible and reduce the complexity of system implementation, the terminal in the present invention uses a single antenna to transmit data. On the base station side, there is no such limitation, so the base station uses multiple antennas to transmit and receive data.

Through the present invention, the system divides all base stations into several baseband pools. Sectors in the same baseband pool can share scheduling information and terminal measurement feedback information. Baseband pools can be set large or small. For example, a base station or Three sectors under different base stations are regarded as a baseband pool, or a total of 21 sectors under seven geographically adjacent base stations are regarded as a baseband pool. The maximum number of sectors contained in the baseband pool is not limited and depends on the processing capability of the baseband pool. Since the sector scheduling information in the baseband pool and the information fed back by terminal measurement can be shared, the terminals in a baseband pool can be uniformly scheduled.

First, the baseband pool determines a set of coordinated scheduling sectors for each terminal, where the set of coordinated scheduling sectors for each terminal can be determined according to RSRQ (Reference Signal Received Power, reference signal received power) measurement information fed back by the terminal. In the baseband pool, the priority order of sectors is generated according to certain principles, and the order of scheduling of each sector under the baseband pool is determined, and then each sector calculates the number of each terminal to be scheduled according to the CQI (Channel Quality Information, Channel Quality Information) fed back by the terminal. the priority value of . For the sector with the highest priority, the interference to other sectors can be ignored, and the scheduling can be performed directly according to the traditional scheduling principles (including the proportional fair scheduling principle, the maximum signal-to-interference and noise ratio scheduling principle, etc.), and then complete the other sectors sequentially Scheduling, when the non-highest priority sector is scheduled, after allocating resources to the terminal according to the traditional scheduling principle, further consideration must be given to the interference caused by scheduling the terminal to other scheduled terminals. When scheduling M(M>1) sectors, it is necessary to consider the interference caused by the terminals already scheduled by the sectors whose priorities are No. 1, 2...M-1. If the interference is too large, you need to change another resource Blocks are scheduled until the interference meets the conditions. If all resource blocks cause too much interference to other terminals, scheduling cannot be performed in this frame.

Judging whether the interference is too large is different for the uplink system and the downlink system. For the uplink system, since the sectors under the same baseband pool can share the scheduling allocation information of all terminals and the channel information obtained by measurement, it can be estimated that the terminal will be scheduled after the resource block is scheduled when resources are allocated to the terminal. How much interference is caused to the scheduled terminal? If the interference is too large, so that the signal-to-interference-noise ratio reduction ratio of the scheduled terminal exceeds a certain threshold value, the resource cannot be allocated to the terminal, and other resource blocks need to be replaced. Allocation, if the above conditions are met, the resource block can be allocated to the terminal.

Judging whether the interference is too large, for the downlink system, since the base station cannot know the downlink channel coefficient measured by the terminal, the terminal needs to feed back, but since the direct feedback channel coefficient is too expensive, the terminal in the present invention measures the serving sector and After the channel coefficients of adjacent cooperative sectors, the correlation coefficients between the serving sector and each cooperative sector need to be calculated separately, and compared with a given threshold. If the correlation coefficient is greater than the given threshold, the feedback will be 1, and if it is smaller, the feedback will be 0. You can A value representing the correlation coefficient is fed back on each RB, or only one value representing the correlation coefficient can be fed back on each subband (subband), and the granularity of the feedback is flexibly configured by the system. Assuming that the serving sector of UEa is Ca, the coordinated scheduling sectors are Cb and Cc respectively, and the feedback granularity configured by the system is one for each RB, then UEa needs to calculate sector Ca and sector Cb on each RB respectively. The correlation coefficient of sector Ca and sector Cc is compared with a given threshold to determine whether it is 0 or 1, and then all the generated correlation coefficients are fed back to the serving sector, and the serving sector then shares the information with the same All sectors under the baseband pool.

Assuming that the sectors in the baseband pool are sorted according to their priority, they are C1, C2, C3...CN, when the sector CM (1<M<N) is determined to allocate RBi to the UE according to the scheduling criteria, it is necessary to find out C1, C2...CM-1 sectors have already scheduled terminals in RBi, and then determine whether the scheduling of this sector will cause interference to the terminals according to the channel correlation coefficient indication information fed back by the scheduled terminals, taking sector CM-1 as the For example, assuming that the scheduled terminal is UE(m-1), if the cooperating sector of the terminal does not include the current sector CM, there is no need to consider the impact on the terminal UE(m-1), if the cooperating sector of the terminal Including the current sector CM, and the channel correlation coefficient fed back on the corresponding RB is 0, and there is no need to consider the impact on the terminal UE(m-1), if the cooperative sector of the terminal includes the current sector CM, and in the corresponding If the channel correlation coefficient fed back on the RB is 1, it is necessary to further consider how much interference the scheduling terminal UE has on the UE (m-1). If the interference is too large, the signal interference of the scheduled terminal UE (m-1) If the noise ratio reduction ratio exceeds a certain threshold value, the resource cannot be allocated to the terminal, and other resource blocks need to be allocated for allocation. Otherwise, it indicates the impact of allocating the resource block to the terminal UE on UE(m-1) Acceptable, and then consider the impact on the terminal scheduled by the next sector. If the impact on all terminals scheduled on the RBi is acceptable, the resource block can be allocated to the terminal, otherwise it needs to be changed to another resource block Assigned to UE, continue to judge according to the above method.

If there are not many sectors in the baseband pool, for example, only three sectors form a baseband pool, which can be three sectors under the same base station or three sectors under different base stations, then it is not necessary to Determine the set of cooperative sectors of the terminal. By default, the cooperative sectors are two adjacent sectors. Then, before scheduling a resource block, the terminal needs to estimate that the sector that has completed the scheduling assignment will be scheduled on the resource block. That is to say, since the terminals in the sector with higher priority are scheduled first, the less interference to terminals in other sectors needs to be considered, the fewer constraints are, and the more likely to select the most Optimal resource blocks, and the post-scheduling allocation of terminals in low-priority sectors, because the more terminals have been scheduled and allocated before, the more terminals need to interfere with other terminals, and the fewer available resource blocks.

Another way is not to consider the interference to terminals on the same resource block of all sectors with higher priority under the same baseband pool one by one, but to selectively consider the interference to some sectors, specifically:

Each sector under the baseband pool can determine the cooperative sector set of the terminal according to the measurement results reported by the terminal. Assume that the terminal is U, its serving sector is S, and the sectors whose measurement information meets certain conditions and are located in the same baseband pool are {N1 , N2, N3}, then the set of cooperative sectors of U is {N1, N2, N3}. If according to certain rules, it is judged that there is only one element in the set of cooperative sectors of terminal U, that is, only the serving sector, then the The terminal is an inner ring terminal, otherwise it is an edge terminal. If the scheduled terminal is an inner-ring terminal, there is no need to consider the interference of the terminal to other terminals. If the terminal is an edge terminal, before scheduling the terminal, it is necessary to estimate the interference of the terminal to the terminal that has been scheduled by its cooperative sector . Wherein, the edge terminal further includes a near-point edge terminal and a far-point edge terminal. Wherein, the inner-ring terminal and the far-point edge terminal are collectively referred to as a terminal without a cooperative sector, and the near-point edge terminal is referred to as a terminal with a cooperative sector.

When the number of sectors in the baseband pool is large, for example, there are 57 sectors in three layers, the above method can reduce the calculation amount.

An embodiment of the present invention provides a coordinated scheduling method, including:

Prioritize the sectors in the baseband pool;

Take out the sector with the highest priority, and after allocating resources for terminals in the sector, take out other sectors in the baseband pool in order of priority from high to low, and perform the following operations for each taken out sector:

According to the scheduling priority, the terminal with the highest priority among the terminals to be scheduled in the current sector is taken out, and the idle resource blocks are sorted according to the signal quality value obtained by the terminal on each idle resource block, in order of signal quality from good to bad Take out a free resource block, and judge whether the preset allocation condition is satisfied, if so, allocate the free resource block to the terminal, otherwise, continue to take out the next free resource block for judgment, until the free resource is allocated to the terminal block or judge that all free resource blocks cannot be allocated to the terminal; and so on, obtain the next terminal to be scheduled in the current sector, and perform resource scheduling until the scheduling of all terminals to be scheduled in the current sector is completed.

Among them, determine whether the preset allocation conditions are met according to the following method:

Judging when the currently retrieved idle resource block is allocated to the current terminal to be scheduled, whether the interference of the currently unscheduled terminal to each terminal under the baseband pool scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or caused by interference Whether the signal quality degradation is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Among them, determine whether the preset allocation conditions are met according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is satisfied;

If the current terminal to be scheduled has a cooperative sector, then:

Judging when the currently fetched idle resource block is allocated to the current to-be-scheduled terminal, whether the interference of the current to-be-scheduled terminal to each terminal scheduled on the currently fetched idle resource block by the cooperating sectors is less than or equal to Whether the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, if yes, the preset allocation condition is satisfied; otherwise, the preset allocation condition is not satisfied.

Among them, determine whether the preset allocation conditions are met according to the following method:

If the current terminal to be scheduled has no cooperative sector, the preset allocation condition is satisfied;

If the current terminal to be scheduled has a cooperative sector, then:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi meets the following conditions, SectorM is not a cooperative sector of UEi; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to the sector The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold; the preset allocation condition is met; otherwise, the preset allocation condition is not met;

The first specified value indicates that the correlation coefficient between the channel coefficient from UEi to its serving sector Sectori and the channel coefficient to the sector SectorM on the currently retrieved idle resource block is smaller than a given threshold.

Among them, determine whether the preset allocation conditions are met according to the following method:

Assume that the currently retrieved sector is SectorM, and the current terminal to be scheduled in this sector is UEM. For the m UEi scheduled on the currently retrieved idle resource block, i=1...m, where m is greater than or equal to 1, the sector to which UEi belongs for Sectori;

If each UEi satisfies the following conditions: SectorM is not a cooperative sector of UEi; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently retrieved idle resource block is the same as that to the The correlation coefficient indication value of the channel coefficient of the sector SectorM is the first specified value; or, SectorM is a cooperative sector of UEi, and the channel coefficient from UEi to its serving sector Sectori on the currently fetched idle resource block is the same as that to all The correlation coefficient indication value of the channel coefficient of the sector SectorM is not the first specified value, and the interference of the UEM to the terminal UEi scheduled on the currently retrieved idle resource block is less than or equal to the interference threshold or the signal quality degradation caused by the interference is less than or equal to the signal quality threshold, the preset distribution condition is satisfied; otherwise, the preset distribution condition is not satisfied.

Among them, it is judged as follows whether the signal quality degradation caused by the interference of the terminal currently to be scheduled to the terminal scheduled on the currently retrieved idle resource block is less than or equal to the signal quality threshold:

Calculating the new signal quality value and the original signal quality value of the terminal scheduled on the currently fetched idle resource block when the currently fetched idle resource block is allocated or not allocated to the terminal to be scheduled, according to the new signal The quality value and the original signal quality value obtain a variation, such as the overall spectrum variation, and compare the overall spectrum variation with the preset overall spectrum variation threshold. If it is less than or equal to the overall spectrum variation threshold, the interference caused The signal quality degradation is less than or equal to the signal quality threshold; otherwise, the signal quality degradation caused by interference is greater than the signal quality threshold. The present invention is not limited to using the overall spectrum variation to represent signal quality degradation, and another parameter representing signal quality degradation may also be obtained according to the new signal quality value and the original signal quality value.

Wherein, the signal quality value is an SINR value; of course, it may also be represented by other parameters except the SINR value, which is not limited in the present invention.

Obtaining the overall spectrum variation according to the new signal quality value and the original signal quality value includes:

Among them, SINR _UE is the original signal quality value, NewSINR _UE is the new signal quality value, and ΔSE _UE is the overall spectrum efficiency change.

Wherein, the method also includes:

The serving sector of the terminal compares the modulation and coding set MCS corresponding to the channel quality indicator CQI fed back by the terminal with a given MCS threshold, and if it is smaller than the MCS threshold, it is a far-point edge terminal;

Otherwise, the serving sector of the terminal counts the reference signal received power RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, and compares the difference between the two with the given A predetermined measurement difference threshold, if it is smaller than the measurement difference threshold, the adjacent sector is the cooperative sector of the terminal; if the terminal does not have a cooperative sector, the terminal is an inner ring terminal, otherwise it is a close point edge terminal;

Whether the terminal has a cooperative sector is judged according to the following method: when the terminal is a far-point edge terminal or an inner-ring terminal, there is no cooperative sector; when the terminal is a near-point edge terminal, there is a cooperative sector.

The terminal classification may not use the above MCS and RSRQ information, or may be directly classified according to the geographic location, which is not limited in the present invention.

Specific implementation mode 1

According to an embodiment of the present invention, a method for coordinating interference scheduling of sectors located in the same baseband pool in an OFDM uplink (terminal transmitting data, base station receiving data) transmission system is provided. The specific implementation steps include:

In step S101, the system configures an update period T1 for coordinated scheduling of sectors in the baseband pool. The scheduling information of sectors in the same baseband pool is not updated within the T1 period;

In step S102, each serving sector collects statistics on MCS (Modulating and coding set) information and RSRQ (Reference Signal Received Power) measurement information fed back by the terminal to determine the type of the terminal. The specific method is as follows:

The serving sector counts the MCS information corresponding to the CQI (channel quality measurement information) fed back by the terminal, and compares the fed-back MCS with the given MCS threshold. If it is smaller than the given MCS threshold, it is a far-point edge terminal, otherwise it needs to Further judgments are as follows:

The serving sector counts the RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, and compares the difference between the two with the given measurement difference threshold, which will satisfy the measurement value The sector index whose difference is less than the measurement difference threshold is added to the cooperative sector list; if the element in the cooperative sector list is empty, the terminal is an inner-ring terminal, otherwise it is a near-point edge terminal, and the cooperative sector list The sector of is the COMP set sector of the near-point edge terminal;

Step S103, each serving sector Sector(j) counts the interference situation Rnn(j,k) received by UEs from sectors outside the baseband pool on each frequency subband in the past scheduling period, because the sector set of the baseband pool The instantaneous interference channel other than can not be obtained, so Rnn(j,k) can only use the average value of long-term statistics To approximate, and because the instantaneous interference channel outside the sector of the baseband pool cannot be obtained, but the instantaneous interference channel of the sector in the baseband pool can be obtained, so the total Rnn_Total measured can be subtracted from the sector in the baseband pool set The resulting instantaneous interference Rnn_inner approximates the interference Rnn outside the baseband pool sector set;

in,

Trace is a matrix trace operator;

is the autocorrelation matrix of the total interference and noise received by Sector(j) on RB(k);

It is the autocorrelation matrix of the interference and noise of Sector (j) received on RB (k) from other sector UEs in the sector under the baseband pool except the serving sector; I is the number minus the number of sectors in the baseband pool 1;

RxNum indicates the number of receiving antennas;

Step S104, prioritizing the sectors in the baseband pool, and determining the scheduling order of the sectors in the baseband pool, the priority determination method may be one of the following:

Multiple sectors randomly generate decimals between [0,1], the larger the number, the higher the priority;

Sort according to the traffic size of the sectors in the baseband pool in the previous cycle, the smaller the traffic, the higher the priority;

Assuming that there are N sectors in the baseband pool, the scheduling priority order from high to low is Sector1, Sector2, Sector3, ... SectorN-1, SectorN. Then record the ordered set Schdsec={Sector1, Sector2, Sector3, . . . SectorN-1, SectorN}.

The above sorting method is only an example, and other sorting methods can be used as required, which is not limited in the present invention.

In step S105, the sector Sector1 represented by the first element in the ordered set Schdsec is taken, and resource allocation and scheduling are performed on the sector first, and the first element is deleted from the ordered set Schdsec after the scheduling is completed. Refer to the prior art for specific scheduling methods. For example, for terminals in a sector, a proportional fair scheduling algorithm is used to determine resource allocation results in combination with CQI information fed back by the terminals and traffic information of each terminal.

Step S106, take the sector SectorM represented by the first element in the ordered set Schdsec. Initially, M=2, and the SectorM sector starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming UE(i), combined with the transmit power of UE(i), estimates the SINR value that UE(i) can obtain on each idle resource block RB(k), assuming SINR _{UE(i), RB(k)} , a The calculation method is:

Among them, H _RB(k) represents the channel coefficient of UE(i) to SectorM on RB(k), is the interference power received by SectorM from outside the baseband pool sector, which is calculated in step S103. It is an autocorrelation matrix of interference and noise from UEs in M-1 sectors already scheduled in sectors under the baseband pool that SectorM receives on RB(k);

Step S107, sort the SINR _{UE(i), RB(k)} of UE(i) on each RB from large to small, and store the corresponding RB index number in TmpSchd _UE(i) ;

Step S108, take out the first index from TmpSchd _UE(i) , assuming it is RB(k), first determine the terminal type of UE(i), if it is not a near-point edge terminal, directly assign RB(k) to UE(i), then perform step S110, if it is a near-point edge terminal, perform the following operations, of course, it is also possible to perform the following operations uniformly without performing terminal type judgment:

Due to the co-channel interference generated by UE(i), the SINR of the terminals already scheduled by sectors Sector1, Sector2, ... SectorM-1 on RB(k) will decrease. Assuming that the terminal scheduled by sector Sector1 is UE1, then UE1's new SINR is NewSINR _{UE1, RB(k)} ;

in, It is the Rnn value calculated when UE1 is not subjected to the co-channel interference generated by UE(i), which may already include the co-channel interference of other allocated terminals. H _RB(k) represents the equivalent channel coefficient value from UE1 to the serving sector Sector1 on RB(k), H _{UE(i), RB(k)} represents the interference source UE(i) to Sector1 on RB(k), etc. Effective channel coefficient value;

The original SINR of UE1 on RB(k) is SINR _UE1,RB(k) ;

The change amount ΔSE UE1 of the overall spectral efficiency caused by the existence of UE(i) on RB(k) of _UE1 ;

When ΔSE _UE1 is greater than a given threshold value, execute step S109; otherwise, according to the above method, continue to judge and schedule UE(i) to interfere with UE2, UE3, ... UEM-1 sequentially, as long as any ΔSE _UE is judged If it is greater than a given threshold value, then execute step S109, otherwise, if all ΔSE _UEs are less than or equal to a given threshold value, allocate RB(k) resources to UE(i), and then execute step S110 ;

Step S109, scheduling terminal UE(i) on RB(k) interferes too much with terminals in other sectors, then delete RB(k) from the TmpSchd _UE(i) set, and return to step S108; if all If ΔSE _UE1 on RB(k) is greater than a given threshold value, then the terminal cannot be scheduled, and then go to step S110;

Step S110, delete UE(i) in the terminal set to be scheduled, if the set of terminals to be scheduled is not empty, go to step S107; if the set of terminals to be scheduled is empty, SectorM scheduling is completed, delete the first element from Schdsec , judge whether the Schdsec set is empty, if yes, go to step S111, otherwise go to step S106.

Step S111, complete the scheduling and exit the scheduling cycle.

Through this method, the interference can be estimated, and the terminals in the sectors are scheduled in sequence according to the priority order. The terminals in the sector with high priority can choose the optimal resource block scheduling regardless of the interference to the terminals in the sector with low priority. That is, when a terminal in a sector with a low priority selects a resource block during scheduling, it must consider the impact on a terminal in a sector with a high priority. If the interference caused is too large, the corresponding resource block cannot In this method, under the premise of ensuring that the terminals in the sector with high priority are allocated to the optimal resource block, as far as possible, the terminals with strong mutual interference between the cooperative sectors are allocated to different resource blocks. frequency subband resources to achieve interference coordination, improve the overall spectral efficiency and the spectral efficiency of edge terminals.

Specific implementation mode 2

According to an embodiment of the present invention, a downlink (base station transmits data, terminal receives data) OFDM system provides a method and process for performing interference coordination scheduling for sectors located in the same baseband pool, and the specific implementation steps include:

In step S201, the system configures an update period T1 for coordinated scheduling of sectors in the baseband pool. The scheduling information of sectors in the same baseband pool is not updated within the T1 period;

In step S202, each serving sector collects statistics on MCS (Modulating and coding set) information and RSRQ (Reference Signal Received Power) measurement information fed back by the terminal to determine the type of the terminal. The specific method is as follows:

The serving sector counts the feedback MCS information of the terminal, compares the size of the fed back MCS with the given threshold, if it is less than the given threshold, it is a far-point edge terminal, otherwise further judgment is required, as follows:

The serving sector counts the RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, compares the difference between the two with the given threshold, and the difference between the measured values is less than the given threshold. The sector index with a fixed threshold is added to the cooperative sector list; if the element in the cooperative sector list is empty, the terminal is an inner-ring terminal, otherwise it is a near-point edge terminal, and the sector in the cooperative sector list is all Describe the COMP set sector of the near-point edge terminal;

Step S203, each serving sector Sector(j) counts the CQI fed back by each terminal in the past scheduling period, converts the equivalent signal-to-interference-noise ratio SINR, and then combines the transmit power S of the base station to calculate the CQI of the terminal on each resource block Equivalent interference power NI=S/SINR, since the transmit power and channel coefficients of sectors in the same baseband pool can be shared, the interference values I ₁ , I ₂ ,...I _M caused by other sectors in the same baseband pool can be estimated. The equivalent interference power received on each resource block from outside the baseband pool sector is NIout=NI-I ₁ -I ₂ -...-I _M ;

Step S204, performing priority sorting on the sectors in the baseband pool, and determining the scheduling order of the sectors in the baseband pool, and the priority determination method may be one of the following:

Multiple sectors randomly generate decimals between [0,1], the larger the number, the higher the priority;

Sort according to the traffic size of the sectors in the baseband pool in the previous cycle, the smaller the traffic, the higher the priority;

Assuming that there are N sectors in the baseband pool, the order of scheduling priority from high to low is Sector1, Sector2, Sector3,...SectorN-1, SectorN. Then record the ordered set Schdsec={Sector1, Sector2, Sector3, . . . SectorN-1, SectorN}.

Step S205, for near-point edge terminals, it is necessary to measure the channel coefficients from the terminal to the serving sector and the sectors in the terminal cooperation sector list on each resource block, and then calculate the correlation between the two, when the correlation coefficient is less than When the threshold value is given by the system, the feedback indicates 0, otherwise the feedback is 1, assuming that the serving sector of UE1 is Sector1, and the cooperating sectors are Sector2 and Sector3, then on the resource block RB(k), the channel coefficients measured by UE1 are sequentially They are H _{ue, sector1} , H _{ue, sector2} , H _{ue, sector3} , then it is assumed that the correlation coefficient between H _{ue, k, sector1} and H _{ue, k, sector2} is less than the threshold value, H _{ue, k, sector1} and H _{ue, k, the correlation coefficient of sector3} is greater than the threshold, then the terminal UE feeds back to the indication of the resource block RB(k) corresponding to the representative of the serving sector Sector1 is 01, in order to save overhead, the terminal does not need to calculate the correlation on all RBs, only It is only necessary to extract some RBs for calculation, and the extraction density is configured by the system; wherein, in order to save overhead, the terminal may only feed back the correlation coefficient indication values of the sectors that have been scheduled.

Step S206, take the sector Sector1 represented by the first element in the ordered set Schdsec, the sector first performs resource allocation, and for the terminals in the sector, combined with the CQI information fed back by the terminal and the traffic information of each terminal, the utilization ratio The fair scheduling algorithm determines the result of resource allocation, and deletes the first element from the ordered set Schdsec after scheduling.

Step S207, take the sector SectorM represented by the first element in the ordered set Schdsec. Initially, M=2, and the SectorM sector starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming UE(i), based on the CQI fed back by UE(i), sorts the CQI levels of UE(i) on each RB from large to small, and stores the corresponding RB index number in TmpSchd _UE(i) ;

Step S208, take out the first index from TmpSchd _UE(i) , assuming it is RB(k), first determine the terminal type of UE(i), if it is not a near-point edge terminal, directly assign RB(k) to UE(i), then perform step S210, if it is a near-point edge terminal, perform the following operations, or do not perform terminal type judgment, and perform the following operations uniformly:

Due to the co-channel interference generated by UE(i), the SINR of the terminals already scheduled by sectors Sector1, Sector2, ... SectorM-1 on RB(k) will decrease. Assume that sectors Sector1, Sector2, ... SectorM-1 are in RB( The terminals that have been scheduled on k) are UE1, UE2, ... UEM-1 respectively, and the impact of scheduling UE(i) on the terminals UE1, UE2, ... UEM-1 is judged in turn.

For UE1, first judge whether there is SectorM in its cooperative sector set, if not, it means that the scheduling UE(i) has little impact on UE1, and continue to judge the impact on the next UE, if UE1 cooperates with the sector If there is SectorM in the set, it is necessary to judge the correlation coefficient indication value of the channel coefficient to the serving sector on the RB(k) fed back by UE1 and the channel coefficient to SectorM. If it is 0, it indicates that the scheduling UE(i ) has little impact on UE1, just continue to judge the impact on the next UE. If it is 1, it indicates that the correlation is relatively large, and further judgment is required, as follows:

To calculate the new SINR of UE1, one calculation method is:

NewSINR _{UE1, RB(k)} = S/(NIout+I ₁ );

Where S represents the transmit power of the base station, NIout is calculated in step S203, and I ₁ represents the interference caused by scheduling UE(i) to UE1 in this frame, which can be calculated by the base station.

The original SINR of UE1 on RB(k) is SINR _{UE1, RB(k)} ;

The change amount ΔSE UE1 of the overall spectral efficiency caused by the existence of UE(i) on RB(k) of _UE1 ;

If ΔSE _UE1 is less than the given threshold, it means that the scheduling UE(i) has little impact on UE1, just continue to judge the impact on the next UE, otherwise, do not allocate RB(k) resources to UE(i), and perform the steps S209.

According to the above method, the impact of scheduling UE(i) on terminals UE1, UE2, ... UEM-1 is determined in sequence. If the impact of scheduling UEi on terminals UE1, UE2, ... UEM-1 is very small, then RB(k) The resource is allocated to UE(i), and then step S209 is performed;

Step S209, delete RB(k) from the TmpSchd set, and return to step S208; if all RB(k) do not meet the conditions, the terminal cannot be scheduled, and proceed to step S210;

Step S210, delete UE(i) from the terminal set to be scheduled in the current sector, if the set of terminals to be scheduled is not empty, then go to step S207 to schedule the next terminal; if the set of terminals to be scheduled is empty, the sector Zone scheduling is completed, delete the current sector SectorM from the ordered set Schdsec, if the set Schdsec is empty, then the baseband pool scheduling is completed, and proceed to step S211, if the set Schdsec is not empty, then proceed to step S206, and proceed to the next step Sector scheduling.

In step S211, the scheduling is completed and the scheduling loop is exited.

Through this method, the interference can be estimated, and the terminals in the sectors are scheduled in sequence according to the priority order. The terminals in the sector with high priority can choose the optimal resource block scheduling regardless of the interference to the terminals in the sector with low priority. That is, when a terminal in a sector with a low priority selects a resource block during scheduling, it must consider the impact on a terminal in a sector with a high priority. If the interference caused is too large, the corresponding resource block cannot In this method, under the premise of ensuring that the terminals in the sector with high priority are allocated to the optimal resource block, as far as possible, the terminals with strong mutual interference between the cooperative sectors are allocated to different resource blocks. In order to achieve interference coordination, improve the overall spectral efficiency and the spectral efficiency of edge terminals, and to simplify the algorithm, for far-point edge terminals and inner ring terminals, there is no need to consider the interference to other sector terminals, directly It is enough to select the optimal resource block scheduling. For near-point edge terminals, it is necessary to judge factors such as channel correlation and interference power to determine whether the terminal can allocate corresponding resource blocks.

Example 1

According to an embodiment of the present invention, there is provided a method and process for interference coordination scheduling of three sectors under the same base station in an OFDM uplink (terminal transmits data, base station receives data) transmission system, as shown in the figure 1 to 4, including:

In step S301, the system configures an update period T1 for coordinated scheduling of sectors in the baseband pool. The scheduling information of the three sectors under the same base station is not updated within the T1 period;

In step S302, each serving sector collects statistics on the MCS information and RSRQ measurement information fed back by the terminal to determine the type of the terminal. The specific method is as follows:

The serving sector counts the feedback MCS information of the terminal, and compares the feedback MCS with the given threshold. If it is smaller than the given threshold, it is a far-point edge terminal. Otherwise, further judgment is required, as follows:

The serving sector counts the RSRQ measurement information reported by the terminal to two adjacent sectors and the RSRQ measurement information from the terminal to the serving sector, and compares the difference between the two with the given threshold, which will satisfy the measured value difference The sector index smaller than the given threshold is added to the cooperative sector list; if the element in the cooperative sector list is empty, the terminal is an inner-ring terminal, otherwise it is a near-point edge terminal, and the sector in the cooperative sector list It is the COMP set sector of the near-point edge terminal. Generally speaking, for a three-sector system, the number of cooperative sectors of the near-point edge terminal is 1, and at most 2;

Step S303, each serving sector Sector(j) counts the interference situation Rnn(j,k) received by each frequency subband in the past scheduling cycle from UEs other than the three sectors of the base station, because the three sectors of the base station The instantaneous interference channel outside the set cannot be obtained, so Rnn(j,k) can only use the average value of long-term statistics To approximate, and because the instantaneous interference channel outside the three sectors in the base station cannot be obtained, but the instantaneous interference channel in the three sectors in the base station can be obtained, so the total Rnn_Total measured can be subtracted from the sector set of the base station The instantaneous interference Rnn_inner within approximates the Rnn outside the baseband pool sector set:

in,

Trace is a matrix trace operator;

is the autocorrelation matrix of the total interference and noise received by Sector(j) on RB(k);

It is the autocorrelation matrix of the interference and noise of Sector(j) received on RB(k) from UEs in the other two sectors except the serving sector in the next three sectors of the base station; I=2;

RxNum indicates the number of receiving antennas;

Step S304, perform priority sorting on the three sectors in the base station, and determine the scheduling order of the three sectors, and the priority determination method may be one of the following:

The three sectors randomly generate decimals between [0,1], the larger the number, the higher the priority;

Sort according to the traffic size of the last cycle of the three sectors, the smaller the traffic, the higher the priority;

Assume that in this embodiment, the scheduling priorities are Sector2, Sector1, and Sector3 from high to low.

In step S305, the Sector2 sector first performs resource allocation, and for the terminals in the sector, combined with the CQI information fed back by the terminals and the traffic information of each terminal, a proportional fair scheduling algorithm is used to determine the resource allocation result. as shown in picture 2.

Step S306, Sector 1 starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming it is UE(i). Combined with the transmit power of UE(i), it is estimated that UE(i) is in each idle resource The SINR value that can be obtained on the block RB(k) is assumed to be SINR _{UE(i), RB(k)} ;

Among them, H _RB(k) represents the channel coefficient from UE(i) to Sector1 on RB(k), H _{2, RB(k)} represents the channel coefficient from the terminal scheduled by Sector2 on RB(k) to Sector1, is the interference power received by Sector1 from outside the three sectors of the base station, which is calculated in step S303.

Step S307, sort the SINR _{UE(i), RB(k)} of UE(i) on each RB from large to small, and store the corresponding RB index number in TmpSchd _UE(i) ;

Step S308, take out the first index from TmpSchd _UE(i) , assuming it is RB(k), due to the co-channel interference generated by UE(i), the SINR of the terminal already scheduled by Sector2 on RB(k) will decrease, Assuming that the scheduled terminal is UE1 of Sector2, the new SINR of UE1 is NewSINR _UE1,RB(k) :

in, It is the Rnn value calculated when UE1 is not subjected to the co-channel interference generated by UE(i), which may already include the co-channel interference of other allocated UEs. H _RB(k) represents the equivalent channel coefficient value from UE1 to the serving sector Sector2 on RB(k), H _{UE(i), RB(k)} represents the interference source UE(i) to Sector2 on RB(k), etc. Effective channel coefficient value;

The original SINR of UE1 on RB(k) is SINR _UE1,RB(k) (that is, the SINR when not interfered by UE(i));

The change amount ΔSE UE1 of the overall spectral efficiency caused by the existence of UE(i) on RB(k) of _UE1 ;

When ΔSE _UE1 is less than or equal to a given threshold value, allocate RB(k) resources to UE(i), and then perform step S310; otherwise, perform step S309;

Or, first judge the terminal type of UE(i), if it is a near-point edge terminal, execute S308, if it is not a near-point edge terminal, directly assign RB(k) to UE(i), and then execute step S310;

Step S309, when ΔSE _UE1 is greater than a given threshold, delete RB(k) from the TmpSchd _UE(i) set, and return to step S308; if all ΔSE _UE1 on RB(k) are greater than a given threshold, then the terminal cannot be scheduled, and proceeds to step S310;

Step S310, delete UE(i) in the scheduling set, if the set of terminals to be scheduled is not empty, go to step S307; if the set of terminals to be scheduled is empty, Sector1 scheduling is completed, and step S311 is executed;

Step S311, Sector3 starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming it is UE3(i). Combined with the transmit power of UE3(i), it is estimated that UE3(i) is in each idle resource The SINR value that can be obtained on block RB(k), assuming SINR _{UE3(i), RB(k)} :

Among them, H _RB(k) represents the channel coefficient from UE3(i) to Sector3 on RB(k), H _{1, RB(k)} represents the channel coefficient from the terminal scheduled by Sector1 on RB(k) to Sector3, H _{2 , RB(k)} represents the channel coefficient from the terminal scheduled by Sector2 on RB(k) to Sector3, is the interference power received by Sector3 from outside the three sectors of the base station, which is calculated in step S303.

Step S312, sort the SINR _{UE(i), RB(k)} of UE3(i) on each RB from large to small, and store the corresponding RB index number in TmpSchd;

Step S313, take out the first index from TmpSchd, assuming RB(k), due to the co-channel interference generated by UE3(i), the SINR of the terminal already scheduled by Sector2 on RB(k) and Sector1 on RB(k) The SINR of the terminals already scheduled above will decrease, assuming that the terminal scheduled by Sector1 is UE1, and the terminal scheduled by Sector2 is UE2, then the new SINR of UE1 is NewSINR _UE1,RB(k) ;

in, It is the Rnn value calculated when UE1 is not subjected to co-channel interference generated by UE3(i), which may already include co-channel interference of other allocated terminals. H _RB(k) represents the equivalent channel coefficient value from UE1 to the serving sector Sector1 on RB(k), H _{UE(i), RB(k)} represents the interference source UE3(i) to Sector1 on RB(k), etc. Effective channel coefficient value;

The original SINR of UE1 on RB(k) is SINR _UE1,RB(k) ;

The change amount ΔSE UE1 of the overall spectral efficiency caused by the existence of UE3(i) on RB(k) of _UE1 ;

The new SINR of UE2 is NewSINR _{UE2, RB(k)} ;

in, It is the Rnn value calculated when UE2 is not subjected to the same-channel interference generated by UE3(i), which may already include the same-channel interference of other allocated terminals. H _RB(k) represents the equivalent channel coefficient value from UE2 to the serving sector Sector2 on RB(k), H _{UE(i), RB(k)} represents the interference source UE3(i) to Sector2 on RB(k), etc. Effective channel coefficient value;

The original SINR of UE2 on RB(k) is SINR _UE2,RB(k) ;

UE2 on RB(k) due to the existence of UE3(i) leads to a change in overall spectral efficiency ΔSE _UE2 ;

When ΔSE _UE1 is less than or equal to a given threshold value, and ΔSE _UE2 is also less than or equal to a given threshold value, allocate RB(k) resources to UE(i), and then execute step S315; otherwise execute Step S314;

Step S314, delete RB(k) from the TmpSchd set, and return to step S313; if all RB(k) do not meet the conditions, the terminal cannot be scheduled, and proceed to step S311;

Step S315, delete UE(i) in the scheduling set, if the set of terminals to be scheduled is not empty, then go to step S311; if the set of terminals to be scheduled is empty, then the scheduling of this sector is completed, and step S316 is executed;

In step S316, the scheduling is completed and the scheduling loop is exited.

Through this method, the interference can be estimated, and the terminals in the sectors are scheduled in sequence according to the priority order. The terminals in the sector with high priority can choose the optimal resource block scheduling regardless of the interference to the terminals in the sector with low priority. That is, when a terminal in a sector with a low priority selects a resource block during scheduling, it must consider the impact on a terminal in a sector with a high priority. If the interference caused is too large, the corresponding resource block cannot In this method, under the premise of ensuring that the terminals in the sector with high priority are allocated to the optimal resource block, as far as possible, the terminals with strong mutual interference between the cooperative sectors are allocated to different resource blocks. In order to achieve interference coordination, improve the overall spectrum efficiency and the spectrum efficiency of edge terminals, this embodiment only considers the coordination of three sectors in the base station, and the algorithm is simple and easy to implement.

Example 2

According to an embodiment of the present invention, there is provided a method and flow for interference coordination scheduling of three sectors under the same base station in a downlink (base station transmits data, terminal receives data) OFDM system, as shown in Figure 5 -7, including:

In step S401, the system configures an update period T1 for coordinated scheduling of sectors in the baseband pool. The scheduling information of the three sectors under the same base station is not updated within the T1 period;

Step S402, each serving sector collects statistics on the MCS information and RSRQ measurement information fed back by the terminal, and determines the type of the terminal and the cooperative transmission sector. The specific method is as follows:

The serving sector counts the feedback MCS information of the terminal, compares the size of the fed-back MCS with the given threshold, if it is less than the given threshold, it is a far-point edge terminal, otherwise further judgment is required, as follows:

The serving sector counts the RSRQ measurement information reported by the terminal to two adjacent sectors under the same base station and the RSRQ measurement information from the terminal to the serving sector, and compares the difference between the two with the given threshold, which will satisfy the measurement Adjacent sector indexes whose value difference is less than a given threshold are added to the cooperative sector list; if the elements in the cooperative sector list are empty, the terminal is an inner-ring terminal, otherwise it is a near-point edge terminal, and the cooperative sector The sectors in the list are the COMP set sectors of the near-point edge terminal. Generally speaking, only one sector is selected for the coordinated transmission of the terminal;

Step S403, each serving sector Sector(j) counts the CQI fed back by each terminal in the past scheduling period, converts the equivalent signal-to-interference-noise ratio SINR, and then combines the transmit power S of the base station to calculate the CQI of the terminal on each resource block Equivalent interference power NI=S/SINR, since the transmit power and channel coefficients of the three sectors under the same base station can be shared, the interference values I ₁ and I ₂ caused by the adjacent sectors under the same base station can be estimated, and the terminal in The equivalent interference power received on each resource block from outside the three sectors of the base station is NIout=NI-I ₁ -I ₂ ;

Step S404, perform priority sorting on the three sectors in the base station, and determine the scheduling order of the three sectors, and the priority determination method may be one of the following:

The three sectors randomly generate decimals between [0,1], the larger the number, the higher the priority;

Sort according to the traffic size of the last cycle of the three sectors, the smaller the traffic, the higher the priority;

In this embodiment, it is assumed that the scheduling priorities are Sector2, Sector1, and Sector3 from high to low.

Step S405, the terminal measures the channel coefficients from the terminal to the serving sector and from the terminal to the adjacent sector on each resource block, which are recorded as H _{ue, sector1} , H _{ue, sector2} , H _{ue, sector3} , and then calculate the When the correlation coefficient is less than a given threshold, the feedback indicates 0, otherwise the feedback is 1, assuming that the serving sector of the terminal UE is Sector1, and on the resource block RB(k), the UE calculates H _{ue, k, sector1} The correlation coefficient with H _{ue, k, sector2} is less than the threshold value, and the correlation coefficient between H _{ue, k, sector1} and H _{ue, k, sector3} is greater than the threshold value, then the indication that the terminal UE feeds back to the serving sector Sector1 is 01, in order to save Overhead, the terminal does not need to calculate the correlation on all RBs, it only needs to extract some RBs for calculation, and the extraction density is configured by the system;

In step S406, the Sector2 sector first performs resource allocation, and for the terminals in the sector, combined with the CQI information fed back by the terminals and the traffic information of each terminal, a proportional fair scheduling algorithm is used to determine the resource allocation result.

Step S407, Sector1 starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming it is UE(i), and combine the CQI fed back by UE(i) to assign UE(i) on each RB The CQI levels are sorted from large to small, and the corresponding RB index numbers are stored in TmpSchd _UE(i) ;

Step S408, take out the first index from TmpSchd _UE(i) , assuming it is RB(k), due to the co-channel interference generated by UE(i), the SINR of the terminal already scheduled by Sector2 on RB(k) will decrease, Assuming that the scheduled terminal is UE1 in Sector2, first judge the indication value of the correlation coefficient between the resource block RB(k) and the serving sector Sector2 and the adjacent sector Sector1 fed back by the terminal UE1. If the indication is 0, it indicates that the influence is very small. RB(k) resources can be allocated to UE(i), and then step S410 is performed; if the indication is 1, it indicates that the correlation is relatively high, and further judgment is required, as follows:

Calculate the new SINR of UE1 as NewSINR _{UE1, RB(k)} = S/(NIout+I1), where S represents the transmit power of the base station, NIout is calculated in step S403, and I ₁ represents the scheduling UE(i) pair in this frame The interference caused by UE1 can be calculated by the base station.

The original SINR of UE1 on RB(k) is SINR _UE1,RB(k) ;

UE1 on RB(k) due to the existence of UE(i) leads to the change of the overall spectral efficiency ΔSE _UE1 :

When ΔSE _UE1 is less than or equal to a given threshold value, allocate RB(k) resources to UE(i), and then perform step S410; otherwise, perform step S409;

Step S409, when ΔSE _UE1 is greater than a given threshold, delete RB(k) from the TmpSchd _UE(i) set, and return to step S408; if all ΔSE _UE1 on RB(k) are greater than a given threshold, then the terminal cannot be scheduled, and proceeds to step S410;

Step S410, delete UE(i) in the terminal set to be scheduled, if the set of terminals to be scheduled is not empty, then go to step S407; if the set of terminals to be scheduled is empty, Sector1 scheduling is completed, and step S411 is executed;

Step S411, Sector 3 starts scheduling and allocating resources. First, determine the terminal with the highest priority according to the proportional fair scheduling algorithm, assuming it is UE(i), and combine the CQI fed back by UE(i) to assign UE(i) on each RB The CQI levels are sorted from large to small, and the corresponding RB index numbers are stored in TmpSchd _UE(i) ;

Step S412, take out the first index from TmpSchd _UE(i) , assuming it is RB(k), due to the co-channel interference generated by UE(i), the SINR of the terminals already scheduled by Sector2 and Sector1 on RB(k) will be Reduce, assuming that the terminal scheduled by Sector1 is UE1, and the terminal scheduled by Sector2 is UE2, first judge the correlation coefficient indication value from the resource block RB(k) fed back by the terminal UE1 to the serving sector Sector1 and the adjacent sector Sector2, and the terminal UE2 Feedback from the resource block RB(k) to the correlation coefficient indication value of the serving sector Sector2 and the adjacent sector Sector1, if both indications are 0, it indicates that the impact is very small, and the RB(k) resource can be allocated to the UE (i), then perform step S411; if any one of the two indications is 1, it indicates that the correlation is relatively large, and further judgment is required, as follows:

If the UE1 feedback indication is 1, calculate the new SINR of UE1:

NewSINR _{UE1, RB(k)} = S/(NIout+I ₃ );

Where S represents the transmit power of the base station, NIout is calculated in step S403, and I ₃ represents the interference caused by scheduling UE(i) to UE1 in this frame, which can be calculated by the base station.

The original SINR of UE1 on RB(k) is SINR _{UE1, RB(k)} ;

The change amount ΔSE UE1 of the overall spectral efficiency caused by the existence of UE(i) on RB(k) of _UE1 ;

If the UE2 feedback indication is 1, calculate the new SINR of UE2:

NewSINR _{UE2, RB(k)} = S/(NIout+I ₃ );

Where S represents the transmit power of the base station, NIout is calculated in step S403, and I ₃ represents the interference caused by scheduling UE(i) to UE2 in this frame, which can be calculated by the base station.

The original SINR of UE2 on RB(k) is SINR _{UE2, RB(k)} ;

The change amount ΔSE UE2 of the overall spectral efficiency caused by the existence of UE(i) on RB(k) of _UE2 ;

If the correlation coefficient feedback indication value of any one of UE1 and UE2 is 1, and the corresponding ΔSE is greater than a given threshold value, then no RB(k) resources are allocated to UE(i), and step S413 is performed, otherwise Allocating RB(k) resources to UE(i), and then performing step S414;

Step S413, delete RB(k) from the TmpSchd set, and return to step S412; if all RB(k) do not meet the conditions, the terminal cannot be scheduled, and proceed to step S411;

Step S414, delete UE(i) in the scheduling set, if the set of terminals to be scheduled is not empty, go to step S411; if the set of terminals to be scheduled is empty, then the scheduling of this sector is completed, and step S415 is executed;

In step S415, the scheduling is completed and the scheduling cycle is exited.

The embodiment of the present invention also provides a coordination scheduling device, as shown in Figure 8, including:

The sector sorting unit is used to prioritize the sectors in the baseband pool;

The first scheduling unit is configured to take out the sector with the highest priority and allocate resources for terminals in the sector;

The control unit is configured to, after the first scheduling unit allocates resources to the terminal in the sector with the highest priority, take out other sectors in the baseband pool in order according to the priority from high to low;

The second scheduling unit is configured to perform the following operations on the sector taken out by the control unit:

According to the scheduling priority, the terminal with the highest priority among the terminals to be scheduled in the current sector is taken out, and the idle resource blocks are sorted according to the signal quality value obtained by the terminal on each idle resource block, in order of signal quality from good to bad Take out a free resource block, and judge whether the preset allocation condition is satisfied, if so, allocate the free resource block to the terminal, otherwise, continue to take out the next free resource block for judgment, until the free resource is allocated to the terminal block or judge that all free resource blocks cannot be allocated to the terminal; and so on, obtain the next terminal to be scheduled in the current sector, and perform resource scheduling until the scheduling of all terminals to be scheduled in the current sector is completed.

The device also includes a terminal type determination unit, configured to compare the modulation and coding set MCS corresponding to the channel quality indicator CQI fed back by the terminal with a given MCS threshold, and if it is smaller than the MCS threshold, it is a far-point edge terminal; otherwise , counting the reference signal received power RSRQ measurement information reported by the terminal to the adjacent sector and the RSRQ measurement information from the terminal to the serving sector, and comparing the difference between the two with a given measurement difference threshold, If it is smaller than the measurement difference threshold, the adjacent sector is the cooperative sector of the terminal; if the terminal does not have a cooperative sector, the terminal is an inner ring terminal, otherwise it is a near-point edge terminal;

The second scheduling unit determines whether the terminal has a cooperative sector according to the terminal type. When the terminal is a far point edge terminal or an inner ring terminal, there is no cooperative sector, and when the terminal is a near point edge terminal, there is a cooperative sector.

For details on how the second scheduling unit schedules, refer to the method embodiments, which will not be repeated here.

Through this method, the interference can be estimated, and the terminals in the sectors are scheduled in sequence according to the order of priority. The terminals in the sector with high priority can choose the optimal resource block scheduling regardless of the interference to the terminals in the sector with low priority. That is, when a terminal in a sector with a low priority selects a resource block during scheduling, it must consider the impact on a terminal in a sector with a high priority. If the interference caused is too large, the corresponding resource block cannot In this method, under the premise of ensuring that the terminals in the sector with high priority are allocated to the optimal resource block, as far as possible, the terminals with strong mutual interference between the cooperative sectors are allocated to different resource blocks. In order to achieve interference coordination, improve the overall spectrum efficiency and the spectrum efficiency of edge terminals, this embodiment only considers the coordination of three sectors in the base station, and the algorithm is simple and easy to implement.

It should be noted that, as an optional solution, each configuration information in the above example may be configured by default according to the protocol, or the upper layer network element may notify the base station after configuration. The upper-layer network element here may be a relay device, a base station controller, an access service network, a connection service network, a core network gateway, and the like.

To sum up, the embodiment of the present invention provides a scheme for coordinated scheduling of multiple sectors in a distributed antenna system, which realizes sector traffic and fairness without adding additional signaling overhead and ensuring sector traffic and fairness as much as possible. Interference coordination between them improves the flow of edge terminals. Moreover, the technical solutions of the embodiments of the present invention do not modify the existing network architecture and current processes, are easy to implement and popularize, and have strong industrial applicability.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A method for coordinated scheduling, comprising:

the sectors in the baseband pool are subjected to priority sequencing;

taking out the sector with the highest priority, after allocating resources for the terminal in the sector, taking out other sectors in the baseband pool in turn from high to low according to the priority, and executing the following operations for each taken out sector:

taking out a terminal with the highest priority from terminals to be scheduled in a current sector according to the scheduling priority, sequencing idle resource blocks according to signal quality values obtained by the terminal on each idle resource block, taking out the idle resource blocks in a sequence from good to poor signal quality, judging whether a preset allocation condition is met, if so, allocating the idle resource block to the terminal, otherwise, continuously taking out the next idle resource block for judgment until the idle resource block is allocated to the terminal or all the idle resource blocks cannot be allocated to the terminal; and analogizing in turn, acquiring a next terminal to be scheduled in the current sector, and performing resource scheduling until scheduling of all terminals to be scheduled in the current sector is completed;

determining whether a preset allocation condition is satisfied according to the following manner:

judging whether the interference of each terminal under the baseband pool scheduled on the currently taken out idle resource block by the currently taken out idle resource block is less than or equal to an interference threshold or whether the signal quality reduction caused by the interference is less than or equal to a signal quality threshold when the currently taken out idle resource block is allocated to the currently scheduled terminal, if so, meeting the preset allocation condition, otherwise, not meeting the preset allocation condition; or the like, or a combination thereof,

if the current terminal to be scheduled has no cooperative sector, the preset allocation condition is met; if the terminal to be scheduled has the cooperative sector, then: judging whether the interference of each terminal scheduled by each cooperative sector on the currently taken out idle resource block by the current terminal to be scheduled is less than or equal to an interference threshold or whether the signal quality reduction caused by the interference is less than or equal to a signal quality threshold when the currently taken out idle resource block is allocated to the current terminal to be scheduled, if so, meeting the preset allocation condition, otherwise, not meeting the preset allocation condition; or,

if the current terminal to be scheduled has no cooperative sector, the preset allocation condition is met; if the terminal to be scheduled has the cooperative sector, then: assuming that a currently taken out sector is SectorM, a current terminal to be scheduled of the sector is UEM, and a sector to which m terminals UEi, i = 1- (8230); m, m is more than or equal to 1, and UEi are dispatched on a currently taken out idle resource block is Sectori; if each UEi meets the following condition, the SectorM is not a cooperative sector of the UEi; or, sectorM is a cooperative sector of UEi, and a correlation coefficient indicating value of a channel coefficient from UEi to its serving sector Sectori on a currently fetched idle resource block and a channel coefficient to the sector SectorM is a first specified value; or SectrM is a cooperative sector of UEi, the correlation coefficient indicating value of the channel coefficient from the UEi to the serving sector Sectori of the UE i on the currently taken out idle resource block and the channel coefficient to the sector SectorM is not a first specified value, and the interference of the UEM on the terminal UEi scheduled on the currently taken out idle resource block is less than or equal to an interference threshold or the signal quality reduction caused by the interference is less than or equal to a signal quality threshold; the preset distribution condition is met; otherwise, the preset distribution condition is not met; the first specified value indicates that a correlation coefficient of a channel coefficient from the UE i to a serving sector Sectori of the UE i on the currently taken out free resource block and a channel coefficient from the UE i to the sector SectorM is smaller than a given threshold value; or,

assuming that a currently taken out sector is SectorM, a current terminal to be scheduled of the sector is UEM, and a sector to which m terminals UEi, i = 1- (8230); m, m is more than or equal to 1, and UEi are dispatched on a currently taken out idle resource block is Sectori; if each UEi satisfies the following condition: sectorM is not a cooperative sector of UEi; or, sectorM is a cooperative sector of UEi, and a correlation coefficient indicating value of a channel coefficient from UEi to its serving sector Sectori on a currently fetched idle resource block and a channel coefficient to the sector SectorM is a first specified value; or, sectorM is a cooperative sector of the ue i, and a correlation coefficient indicating value between a channel coefficient from the ue i to its serving sector Sectori on the currently taken out idle resource block and a channel coefficient to the sector SectorM is not a first specified value, and if interference of the ue m to the terminal ue i scheduled on the currently taken out idle resource block is less than or equal to an interference threshold or signal quality degradation caused by the interference is less than or equal to a signal quality threshold, the preset allocation condition is satisfied; otherwise, the preset distribution condition is not met; the first specified value indicates that the correlation coefficient of the channel coefficient from UEi to its serving sector Sectori on the currently fetched free resource block and the channel coefficient to the sector SectorM is less than a given threshold.

2. The method of claim 1,

judging whether the signal quality reduction caused by the interference of the current terminal to be scheduled to the terminal scheduled on the current taken-out idle resource block is less than or equal to a signal quality threshold or not according to the following mode:

and calculating a new signal quality value and an original signal quality value of the terminal scheduled on the currently taken out idle resource block when the currently taken out idle resource block is allocated or not allocated to the terminal to be scheduled, acquiring the overall spectrum variation according to the new signal quality value and the original signal quality value, comparing the overall spectrum variation with a preset overall spectrum variation threshold, if the overall spectrum variation is less than or equal to the overall spectrum variation threshold, reducing the signal quality caused by interference to be less than or equal to the signal quality threshold, otherwise, reducing the signal quality caused by interference to be more than the signal quality threshold.

3. The method of claim 2,

the signal quality value is an SINR value;

obtaining the overall spectrum variation according to the new signal quality value and the original signal quality value comprises:

wherein, the SINR _UE NewSINR as original signal quality value _UE For new signal quality values, Δ SE _UE Is the overall spectral efficiency variation.

4. The method of claim 1, wherein the method further comprises:

the service sector of the terminal compares the modulation coding set MCS corresponding to the channel quality indicator CQI fed back by the terminal with a given MCS threshold, and if the MCS is smaller than the MCS threshold, the terminal is a far-point edge terminal;

otherwise, the serving sector of the terminal counts reference signal received power (RSRQ) measurement information reported by the terminal to an adjacent sector and RSRQ measurement information reported by the terminal to the serving sector, compares a difference value between the RSRQ measurement information and the reference signal received power (RSRQ) measurement information with a given measurement difference value threshold, and if the RSRQ measurement information is smaller than the measurement difference value threshold, the adjacent sector is a cooperative sector of the terminal; if the terminal has no cooperative sector, the terminal is an inner ring terminal, otherwise, the terminal is a near point edge terminal;

judging whether the terminal has a cooperative sector according to the following modes: when the terminal is a far-point edge terminal or an inner-ring terminal, no cooperative sector exists, and when the terminal is a near-point edge terminal, a cooperative sector exists.

5. A coordinated scheduling apparatus, comprising:

the sector sorting unit is used for carrying out priority sorting on the sectors in the baseband pool;

a first scheduling unit, configured to take out a sector with the highest priority and allocate resources to terminals in the sector;

the control unit is used for taking out other sectors in the baseband pool from high to low in sequence according to the priority after the first scheduling unit allocates resources to the terminal in the sector with the highest priority;

a second scheduling unit, configured to perform the following operations on the sectors taken out by the control unit:

taking out a terminal with the highest priority from terminals to be scheduled in a current sector according to the scheduling priority, sequencing idle resource blocks according to signal quality values obtained by the terminal on each idle resource block, taking out the idle resource blocks from good to bad according to the signal quality, judging whether preset allocation conditions are met, if so, allocating the idle resource blocks to the terminal, otherwise, continuously taking out the next idle resource block for judgment until the idle resource blocks are allocated to the terminal or all the idle resource blocks cannot be allocated to the terminal; and analogizing in turn, acquiring a next terminal to be scheduled in the current sector, and performing resource scheduling until scheduling of all terminals to be scheduled in the current sector is completed;

the second scheduling unit determines whether a preset allocation condition is satisfied according to the following manner:

judging whether the interference of each terminal under the baseband pool scheduled on the currently taken out idle resource block by the currently taken out idle resource block is less than or equal to an interference threshold or whether the signal quality reduction caused by the interference is less than or equal to a signal quality threshold when the currently taken out idle resource block is allocated to the currently scheduled terminal, if so, meeting the preset allocation condition, otherwise, not meeting the preset allocation condition; or,

if the current terminal to be scheduled has no cooperative sector, the preset allocation condition is met; if the terminal to be scheduled has the cooperative sector, then: judging whether the interference of each terminal scheduled by each cooperative sector on the currently taken out idle resource block by the currently taken out idle resource block is less than or equal to an interference threshold or whether the signal quality reduction caused by the interference is less than or equal to a signal quality threshold when the currently taken out idle resource block is allocated to the currently scheduled terminal, if so, meeting the preset allocation condition, otherwise, not meeting the preset allocation condition; or the like, or a combination thereof,

if the current terminal to be scheduled does not have the cooperative sector, the preset allocation condition is met; if the terminal to be scheduled has a cooperative sector, then: assuming that a currently taken out sector is SectorM, a current terminal to be scheduled of the sector is UEM, and for m terminals UEi scheduled on a currently taken out idle resource block, i =1 \8230, wherein m is more than or equal to 1, and the sector to which the UEi belongs is Sectori; if each UEi meets the condition that SectorM is not a cooperative sector of the UEi; or SectorM is a cooperative sector of UEi, and a correlation coefficient indicating value of a channel coefficient from the UEi to a serving sector Sectori of the UE i on the currently extracted free resource block and a channel coefficient from the UE i to the serving sector SectorM is a first specified value; or SectrM is a cooperative sector of UEi, the correlation coefficient indicating value of the channel coefficient from the UEi to the serving sector Sectori of the UE i on the currently taken out idle resource block and the channel coefficient to the sector SectorM is not a first specified value, and the interference of the UEM on the terminal UEi scheduled on the currently taken out idle resource block is less than or equal to an interference threshold or the signal quality reduction caused by the interference is less than or equal to a signal quality threshold; the preset distribution condition is met; otherwise, the preset distribution condition is not met; the first specified value indicates that a correlation coefficient of a channel coefficient from the UE i to a serving sector Sectori of the UE i on the currently taken out free resource block and a channel coefficient from the UE i to the sector SectorM is smaller than a given threshold value; or,

assuming that a currently taken out sector is SectorM, a current terminal to be scheduled of the sector is UEM, and a sector to which m terminals UEi, i = 1- (8230); m, m is more than or equal to 1, and UEi are dispatched on a currently taken out idle resource block is Sectori; if each UEi satisfies the following condition: sectorM is not a cooperative sector of UEi; or, sectorM is a cooperative sector of UEi, and a correlation coefficient indicating value of a channel coefficient from UEi to its serving sector Sectori on a currently fetched idle resource block and a channel coefficient to the sector SectorM is a first specified value; or, sectorM is a cooperative sector of the ue i, and a correlation coefficient indicating value between a channel coefficient from the ue i to its serving sector Sectori on the currently taken out idle resource block and a channel coefficient to the sector SectorM is not a first specified value, and if interference of the ue m to the terminal ue i scheduled on the currently taken out idle resource block is less than or equal to an interference threshold or signal quality degradation caused by the interference is less than or equal to a signal quality threshold, the preset allocation condition is satisfied; otherwise, the preset distribution condition is not met; the first specified value indicates that the correlation coefficient of the channel coefficient from UEi to its serving sector Sectori on the currently fetched free resource block and the channel coefficient to the sector SectorM is less than a given threshold.

6. The apparatus of claim 5,

the second scheduling unit judges whether the signal quality reduction caused by the interference of the current terminal to be scheduled to the terminal scheduled on the current taken-out idle resource block is less than or equal to a signal quality threshold according to the following modes:

and calculating a new signal quality value and an original signal quality value of the terminal scheduled on the currently taken out idle resource block when the currently taken out idle resource block is allocated or not allocated to the terminal to be scheduled, acquiring the overall spectrum variation according to the new signal quality value and the original signal quality value, comparing the overall spectrum variation with a preset overall spectrum variation threshold, if the overall spectrum variation is less than or equal to the overall spectrum variation threshold, reducing the signal quality caused by interference to be less than or equal to the signal quality threshold, otherwise, reducing the signal quality caused by interference to be more than the signal quality threshold.

7. The apparatus of claim 6,

the signal quality value is an SINR value;

the second scheduling unit obtaining the overall spectrum variation according to the new signal quality value and the original signal quality value includes:

wherein, the SINR _UE NewSINR as original signal quality value _UE For new signal quality values, Δ SE _UE The overall spectral efficiency variation.

8. The apparatus of claim 5, wherein the apparatus further comprises a terminal type determining unit, configured to compare a Modulation Coding Set (MCS) corresponding to a Channel Quality Indicator (CQI) fed back by a terminal with a given MCS threshold, and if the MCS is smaller than the MCS threshold, the terminal is a far-point edge terminal; otherwise, counting reference signal received power (RSRQ) measurement information reported by the terminal to an adjacent sector and RSRQ measurement information reported by the terminal to a serving sector, comparing a difference value between the RSRQ measurement information and the RSRQ measurement information with a given measurement difference value threshold, and if the difference value is smaller than the measurement difference value threshold, determining that the adjacent sector is a cooperative sector of the terminal; if the terminal has no cooperative sector, the terminal is an inner ring terminal, otherwise the terminal is a near point edge terminal;

and the second scheduling unit determines whether the terminal has a cooperative sector according to the terminal type, wherein the cooperative sector does not exist when the terminal is a far-point edge terminal or an inner-ring terminal, and the cooperative sector exists when the terminal is a near-point edge terminal.