CN106850147B - Wireless resource scheduling method and device for interference coordination system - Google Patents

Wireless resource scheduling method and device for interference coordination system Download PDF

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CN106850147B
CN106850147B CN201710115425.0A CN201710115425A CN106850147B CN 106850147 B CN106850147 B CN 106850147B CN 201710115425 A CN201710115425 A CN 201710115425A CN 106850147 B CN106850147 B CN 106850147B
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user
priority
interference
resource
uprb
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CN106850147A (en
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唐伦
陈婉
尹生华
石林
陈前斌
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Xi'an Future Aerospace Science and Technology Research Institute Co.,Ltd.
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information

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

Abstract

The invention discloses a wireless resource scheduling method for an interference coordination system, which divides a resource block in a base station into a resource UPRB with higher interference and a resource PRRB with lower interference, the base station evaluates the frequency spectrum efficiency by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the channel quality of a user, and describes the influence degree of the user receiving the interference through an interference influence factor; calculating a scheduling priority; and respectively allocating UPRB and PRRB resources for the users according to the scheduling priority and the user backlog data packet information. By adopting the invention, the users with larger frequency spectrum efficiency difference on the UPRB and the PRRB can have more chances to call the PRRB without limiting the range of scheduling the users on different resources, thereby avoiding the situation of partial resource waste caused by unreasonable user division, improving the effectiveness of resource utilization of the PRRP and the utilization rate of the UPRB and the PRRB resources.

Description

Wireless resource scheduling method and device for interference coordination system
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for scheduling radio resources for an interference coordination system.
Background
In recent years, with the rapid development of intelligent terminals, the traffic demand of users for mobile communication has been explosively increased. In order to meet the requirements of users, the future 5G network is developing towards diversification, broadband, synthesis and intelligence. The LTE-Advanced system introduces the concept of a Heterogeneous Network (HetNet), deploys low-power nodes in the coverage area of a macro cell to enhance coverage, increases the overhead of power and deployment cost, improves the spectrum efficiency of the system through frequency reuse, and can greatly improve the Network capacity. This hierarchical network deployment may enhance coverage quality in a particular area, improve performance for edge users, and reduce macro cell loading. However, as networks become more dense and diversified, the problem of interference becomes more serious. For different Interference problems, 3gpp rel 8 proposes inter-cell Interference Coordination (ICIC), mainly considering that a base station avoids and reduces Interference from multiplexing of frequency domain resources, and represents that the technology is soft frequency multiplexing. In 3GPP Rel 10, an Enhanced Cell interference coordination (eICIC) technology is proposed for the cross-layer interference problem of the heterogeneous network, and an abs (all blank subframe) concept is introduced, and is usually configured in the macro base station to reduce interference of the macro base station to users in a small Cell Range Extension (CRE) area. Further improvement is made in 3GPP Rel 11, FeICIC (Further enhanced ICIC) is provided, a PR-ABS concept is introduced, and compared with eICIC, the loss of the macro base station caused by complete silence of ABS is reduced.
Currently, scheduling in a Long Term Evolution (LTE) system includes: calculating the scheduling priority of each user equipment according to a scheduling algorithm; and sequencing the users according to the priority of the user equipment, and allocating resources to the users according to the priority sequence. When the network adopts the interference coordination technology, the resources of the base station have lower interference and higher resources, namely PRRP and UPRP. Considering that the edge user is subjected to large interference on the UPRP and cannot transmit data effectively, the main purpose of interference coordination is to make the edge user perform scheduling on the PRRP. If the interference situation of the user is not considered, the original priority calculation mode is still adopted, so that the competition priority of the central user on the PRRP is larger, but the difference between the data quantity which can be transmitted by the central user on the PRRP and the data quantity which can be transmitted by the central user on the UPRP is not large, the UPRP cannot be effectively utilized, and the purpose of interference coordination cannot be achieved. In the existing research, it is also proposed to divide the edge users and the center users according to the user channel quality, and then to schedule the two users on different resources, which has the problem that the PRRP of the center user of a certain timeslot may not be enough due to the mismatch between the user division and the capacities of the two types of resources, and the UPRPs of the edge users still remain.
Disclosure of Invention
One of the objectives of the present invention is to provide a method for scheduling radio resources for an interference coordination system; the second purpose of the invention is to provide a wireless resource scheduling device for an interference coordination system; according to the technical scheme, the difference of interference conditions on different resources of a user is considered, and the interference influence factor is introduced into the calculation of the priority of the user, so that the user with larger interference influence can have more chances to call the resource PRRB with lower interference, meanwhile, the range of scheduling the user on different resources is not limited, the situation of partial resource waste caused by unreasonable user division is avoided, the effectiveness of resource utilization of PRRP is improved, and the utilization rate of UPRB and PRRB resources is improved.
One of the purposes of the invention is realized by the following technical scheme:
the invention provides a wireless resource scheduling method for an interference coordination system, which comprises the following steps:
the base station calculates the spectrum efficiency of the user on a high interference resource UPRB and a low interference resource PRRB by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the user channel quality;
respectively calculating the scheduling priority of the user on a high interference resource UPRB and a low interference resource PRRB according to the interference influence factor;
and respectively allocating the high interference resource UPRB and the low interference resource PRRB resources for the user according to the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB and the user backlog data packet information.
Further, the spectral efficiency on the high interference resource UPRB and on the low interference resource PRRB is calculated as follows:
when the PRRB and the URRB are divided from the frequency domain, the user feeds back the wideband CQI of the frequency band corresponding to the UPRB and the frequency band corresponding to the PRRB to the service base station in each TTI, and the spectral efficiency of the user in the URRB and the PRRB is estimated according to the downlink self-adaptive modulation coding principle in the 3GPP protocol;
when the PRRB and the URRB are divided from the time domain, the user feeds back the ABS and the broadband CQI corresponding to the conventional subframe, and the spectral efficiency on the resources of the corresponding PRRB and the URRB is obtained according to the downlink adaptive modulation and coding rule in the 3GPP protocol.
Further, the interference influence factor is defined as follows:
wherein,corresponding spectrum efficiency of the user on the UPRB (uplink packet radio bearer);corresponding spectral efficiency on the low interference resource PRRB for the user.
Further, the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB is calculated as follows:
when the system adopts the frequency domain interference coordination technology, the base station calculates the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates the queue information and the throughput information, then calculates the scheduling priority of the user on the PRRB by utilizing the updated information, and carries out secondary scheduling on the user.
Further, the scheduling priority is specifically calculated in the following manner:
firstly, calculating the original user priority by using an original priority calculation formula, and then calculating the scheduling priority of the user by using the interference influence factor and the original priority;
calculating the UPRB priority: dividing the original priority by the interference influence factor or performing weighted summation with the reciprocal of the interference influence factor;
after scheduling UPRB resources, updating queue and throughput information of users, recalculating the original priority of the updated information, and calculating a new priority by combining the original priority and the interference influence factor;
when calculating the priority of the user on the PPRB, multiplying the original priority by the interference influence factor, or performing weighted summation on the original priority and the interference influence factor;
when the system adopts the time domain interference coordination technology, the scheduling priority of the user on the UPRB or PRRB resource is calculated according to the interference influence factor, and the user is scheduled according to the priority, which is concretely as follows:
further, when the UPRB is scheduled on the current subframe, the calculated priority adopts the result of weighted summation of the original priority divided by the interference influence factor or the reciprocal of the interference influence factor; if the resource scheduled by the current subframe belongs to the PPRB, multiplying the original priority by the interference influence factor or performing weighted summation on the original priority and the interference influence factor when calculating the priority; the method comprises the following specific steps:
selecting a user with the highest current priority, and acquiring the data volume to be transmitted of the user as xbit and the spectral efficiency a bit/RB corresponding to the user, wherein if the UPRB is scheduled by a current subframe, the spectral efficiency is the spectral efficiency measured on the UPRB; if the PPRB is scheduled on the current subframe, the spectral efficiency is correspondingly measured on the PPRB;
estimating the resource quantity required by the user, if the maximum quantity of the resource blocks isA plurality of; randomly selecting the user in the current resourceA resource block; and then selecting the user with the second priority, allocating resources in the same way, and sequentially allocating the resources to the users according to the priority order until all the resources are allocated or all the users are allocated to the resources.
The second purpose of the invention is realized by the following technical scheme:
the invention provides a wireless resource scheduling device for an interference coordination system, which comprises a spectrum efficiency calculation module, a scheduling priority calculation module and a scheduling module;
the spectrum efficiency calculating module is used for calculating the spectrum efficiency of the user on a high interference resource UPRB and a low interference resource PRRB by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the user channel quality by the base station;
the scheduling priority calculating module is used for calculating the scheduling priority of the user on the UPRB (uplink resource block) and the PRRB (low interference resource block) according to the interference influence factors;
the scheduling module is used for respectively allocating the high interference resource UPRB and the low interference resource PRRB resources for the user according to the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB and the user backlog data packet information;
the spectrum efficiency calculating module is configured to calculate the spectrum efficiency on the high interference resource UPRB and the low interference resource PRRB according to the following manner:
when the PRRB and the URRB are divided from the frequency domain, the user feeds back the wideband CQI of the frequency band corresponding to the UPRB and the frequency band corresponding to the PRRB to the service base station in each TTI, and the spectral efficiency of the user in the URRB and the PRRB is estimated according to the downlink self-adaptive modulation coding principle in the 3GPP protocol;
when the PRRB and the URRB are divided from the time domain, the user feeds back the ABS and the broadband CQI corresponding to the conventional subframe, and the spectral efficiency on the resources of the corresponding PRRB and the URRB is obtained according to the downlink adaptive modulation and coding rule in the 3GPP protocol.
Further, the interference influence factor is defined as follows:
wherein,corresponding spectrum efficiency of the user on the UPRB (uplink packet radio bearer);corresponding spectrum efficiency of the user on the low interference resource PRRB;
the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB is calculated according to the following modes:
when the system adopts the frequency domain interference coordination technology, the base station calculates the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates the queue information and the throughput information, then calculates the scheduling priority of the user on the PRRB by utilizing the updated information, and carries out secondary scheduling on the user.
Further, the scheduling priority is specifically calculated in the following manner:
firstly, calculating the original user priority by using an original priority calculation formula, and then calculating the scheduling priority of the user by using the interference influence factor and the original priority;
calculating the UPRB priority: dividing the original priority by the interference influence factor or performing weighted summation with the reciprocal of the interference influence factor;
after scheduling UPRB resources, updating queue and throughput information of users, recalculating the original priority of the updated information, and calculating a new priority by combining the original priority and the interference influence factor;
when calculating the priority of the user on the PPRB, multiplying the original priority by the interference influence factor, or performing weighted summation on the original priority and the interference influence factor;
when the system adopts the time domain interference coordination technology, the scheduling priority of the user on the UPRB or PRRB resource is calculated according to the interference influence factor, and the user is scheduled according to the priority, which is concretely as follows:
further, when the UPRB is scheduled on the current subframe, the calculated priority adopts the result of weighted summation of the original priority divided by the interference influence factor or the reciprocal of the interference influence factor; if the resource scheduled by the current subframe belongs to the PPRB, multiplying the original priority by the interference influence factor or performing weighted summation on the original priority and the interference influence factor when calculating the priority; the method comprises the following specific steps:
selecting a user with the highest current priority, and acquiring the data volume to be transmitted of the user as xbit and the spectral efficiency a bit/RB corresponding to the user, wherein if the UPRB is scheduled by a current subframe, the spectral efficiency is the spectral efficiency measured on the UPRB; if the PPRB is scheduled on the current subframe, the spectral efficiency is correspondingly measured on the PPRB;
estimating the resource quantity required by the user, if the maximum quantity of the resource blocks isA plurality of; randomly selecting the user in the current resourceA resource block; and then selecting the user with the second priority, allocating resources in the same way, and sequentially allocating the resources to the users according to the priority order until all the resources are allocated or all the users are allocated to the resources.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the wireless Resource scheduling method for the interference coordination system, when the interference coordination technology is adopted in the system, Resource blocks in a base station are correspondingly divided into resources (UPRB) with higher interference and resources (PRRB) with lower interference, the base station evaluates the average frequency spectrum efficiency of a user on the UPRB and the PRRB by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the channel quality of the user, considers the difference of the frequency spectrum efficiency of the user on the two resources, defines an interference influence factor and is used for describing the influence degree of the user on receiving the interference; using the interference influence factors and respectively adopting different formulas to calculate the scheduling priority of the user on the two types of resources; and respectively allocating UPRB and PRRB resources for the users according to the scheduling priority of the users on the UPRB and the PRRB and the information of the user backlog data packet. The invention also discloses a resource scheduling device. By adopting the invention, the users with larger frequency spectrum efficiency difference on the UPRB and the PRRB can have more chances to call the PRRB without limiting the range of scheduling the users on different resources, thereby avoiding the situation of partial resource waste caused by unreasonable user division, improving the effectiveness of resource utilization of the PRRP and the utilization rate of the UPRB and the PRRB resources.
The method provided by the invention considers the frequency spectrum efficiency of scheduling different resources by the users in the interference coordination system, calculates the interference influence factors of the users, evaluates the influence degree of the interference on the different users, and calculates the scheduling priorities of the users on the different resources by using the interference influence factors, thereby effectively improving the utilization rate of the whole resources and the effectiveness of PRRB scheduling, avoiding overhigh priority of central users competing PRRB, and improving the frequency spectrum efficiency of the whole system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
The drawings of the present invention are described below.
FIG. 1 is a flowchart illustrating a resource scheduling method according to the present invention;
fig. 2 is a schematic diagram of a frequency domain interference coordination system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a time domain interference coordination system according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a resource scheduling apparatus of a frequency domain interference coordination system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a resource scheduling apparatus of a time domain interference coordination system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a resource scheduling process of the frequency domain interference coordination system according to the present invention.
Fig. 7 is a schematic diagram of a resource scheduling process of the time domain interference coordination system according to the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Example 1
As shown in the figure, the resource scheduling method provided in this embodiment includes the following steps:
a. defining an interference influence factor for measuring the degree of interference influence on a user, evaluating the frequency spectrum efficiency of the user using the UPRB and the PRRB by utilizing the channel feedback information of the user on the UPRB and the PRRB respectively, and calculating the interference influence factor of the user;
b. and respectively calculating the scheduling priority of the user on the UPRB and the PRRB by utilizing the interference influence factor of the user.
c. And sequencing the users according to the scheduling priorities of the users on the UPRB and the PRRB, and allocating resources for the users by combining the data backlog information of the users without limiting which users are scheduled on the UPRB and which users are scheduled on the PRRB.
The spectral efficiency of the user over the UPRB and PRRB is evaluated in the following manner:
when the PRRB and the URRB are divided from the frequency domain, that is, the network uses ICIC to perform interference coordination (such as partial frequency reuse) from the frequency domain, the user needs to feed back the wideband CQI of the frequency band corresponding to the uprrb and the frequency band corresponding to the PRRB to the serving base station in each TTI, and obtain the spectral efficiency of the user in the URRB and the PRRB according to the downlink adaptive modulation and coding principle in the 3GPP protocol. And calculating the spectrum efficiency according to the CQI corresponding to the ABS fed back by the user and the CQI corresponding to the conventional subframe by referring to a mapping table defined in the 3 GPP.
When the PRRB and the URRB are divided from the time domain, that is, the network adopts ABS (PR-ABS) in eicic (feicic), the user needs to feed back the ABS (PR-ABS) and the wideband CQI corresponding to the normal subframe, and the average spectral efficiency on the resources of the corresponding PRRB and URRB is obtained according to the downlink adaptive modulation and coding rule in the 3GPP protocol.
Specifically, a user reports a wideband CQI, where the CQI is divided into 0 to 15 classes, which are 16 classes, where if the feedback is 0, the channel quality is poor, and the base station cannot provide a service for the user, the CQI is 1 to 15 groups of different modulation and coding schemes, for example, when the CQI is 1, the CQI corresponds to a 4QAM modulation scheme and a coding scheme with a code rate of 78/1024, the spectral efficiency is 78 log4/1000 — 0.1523bit/cu, and if the CQI is converted into a data amount that can be transmitted by one resource block, the CQI is 0.1523 log 352 — 7 — 25.59bit/RB, where one resource block corresponds to 12 subcarriers and 2 slots, and each slot has 7 OFDM symbols.
The definition of the interference influence factor and the broadband CQI fed back by the user are utilized to obtain the spectral efficiency respectively corresponding to the user on the two resources according to the rule of the downlink adaptive modulation and codingAndthe interference influence factor is defined asAn interference impact factor for each user, wherein a larger interference impact factor indicates that the user is more affected by interference on its channel capacity.
And calculating the priority of the user corresponding to the UE in the UPRB and the PRRB by using the interference influence factors of the UE, wherein the priority of the user scheduling the PRRB is in direct proportion to the interference influence factors, and the priority is in inverse proportion to the interference influence factors when the UPRB is scheduled.
The apparatus for scheduling resources of this embodiment includes: the system comprises an interference influence factor calculation module, priority calculation modules 1 and 2 and scheduling modules 1 and 2; wherein:
a. when the system adopts the frequency domain interference coordination method, the base station needs to schedule the UPRB and PRRB resources when scheduling any subframe, and the functions and the working sequence of each part of the device are as follows:
the interference influence factor calculation module is used for calculating the interference influence factors of the users in the current subframe scheduling queue by using the definition of the interference influence factors and sending the interference influence factors of all the users to the priority calculation module;
and the priority calculating module 1 is used for calculating the scheduling priority of the user on the UPRB by utilizing the interference influence factor.
And the scheduling module 1 is configured to allocate the UPRB resource to the user by using the user priority information acquired in the priority calculation module 1, and update the queue information of the user.
And the priority calculating module 2 is used for calculating the scheduling priority of the PRRB resources allocated by the user by utilizing the interference influence factor and the user queue information updated by the scheduling module 1.
And the scheduling module 2 is configured to allocate PRRB resources to the user by using the user priority information acquired in the priority calculation module 2.
b. When the system adopts the time domain interference coordination method, the base station only needs to schedule one of UPRB and PRRB resources when scheduling any subframe, and the functions and the working sequence of each part of the device are as follows:
the interference influence factor calculation module is used for calculating and sending the interference influence factor of the user, if the resource corresponding to the current subframe of the base station belongs to the UPRB, the interference influence factor is sent to the priority calculation module 1, and if not, the interference influence factor is sent to the priority calculation module 2;
and the priority calculating module 1 (or 2) calculates the scheduling priority of the user on the UPRB or (PRRB) and sends the scheduling priority to the scheduling module 1 (or 2).
And the scheduling module 1 (or 2) allocates resources for the users according to the user priorities acquired from the corresponding priority calculation modules and by combining the service types and the data backlog information of the users.
The base station calculates the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates queue information and throughput information, then calculates the scheduling priority of the user on the PRRB by using the updated information, and carries out secondary scheduling on the user;
specifically, the original user priority is calculated by using an original priority calculation formula, and then the scheduling priority of the user is calculated by using the interference influence factor and the original priority.
The calculation mode of the original priority is determined by actual conditions, the calculation modes of the scheduling priorities of different services are different according to the QoS requirements of the services, and the calculation modes of the interference influence factors and the original priority are also determined by the actual conditions.
For the UPRB, the priority may be calculated by dividing the original priority by the interference impact factor, by a weighted sum of the inverse of the interference impact factor, or the like.
After scheduling the UPRB resources, the queue and throughput information of the users can be updated, the original priority is recalculated according to the updated information, the original priority and the interference influence factors are combined to calculate the new priority, when the priority of the users on the UPRB is calculated, the original priority and the interference influence factors can be multiplied, and the original priority and the interference influence factors can also be subjected to weighted summation.
When the system adopts the time domain interference coordination technology, the scheduling priority of the user on the UPRB or PRRB resource is calculated according to the interference influence factor, and the user is scheduled according to the priority.
Specifically, when the UPRB is scheduled in the current subframe, the calculated priority may be the original priority divided by the interference influence factor or a weighted sum of the original priority and the reciprocal of the interference influence factor; if the resource scheduled by the current subframe belongs to the PPRB, the original priority can be multiplied by the interference influence factor when calculating the priority, and the original priority and the interference influence factor can also be subjected to weighted summation.
Specifically, a general method of scheduling of users may include the steps of:
selecting a user with the highest current priority, and acquiring the data volume to be transmitted of the user as xbit and the spectral efficiency a bit/RB corresponding to the user, wherein if a current subframe schedules UPRB, the spectral efficiency is the spectral efficiency measured on UPRB, and if the current subframe schedules PPRB, the spectral efficiency is the spectral efficiency measured on PPRB;
estimating the resource quantity required by the user, if the maximum quantity of the resource blocks isAnd (4) respectively. The user may be randomly selected in the current resourceA resource block;
and then selecting the user with the second priority, and allocating resources in the same way, so that the resources are allocated to the users in sequence according to the priority order until all the resources are allocated or all the users have enough resources.
Example 2
The infinite resource scheduling method for the interference coordination system provided by the embodiment comprises the following steps:
the method comprises the steps of utilizing channel feedback information of a user on a resource (UPRB) with strong interference and a resource (PRRB) with weak interference in an interference coordination system, mapping according to a downlink self-adaptive criterion to obtain the spectral efficiency of the user on the two resources respectively, defining the ratio of the spectral efficiency on the PRRB and the spectral efficiency on the UPRB as an interference influence factor of the user, and measuring the influence degree of the user by the interference. And respectively calculating the scheduling priority of the user on the UPRB and the PRRB by utilizing the interference influence factor.
Specifically, when the system adopts a frequency domain interference coordination technology, the base station needs to calculate the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates information such as queue information and throughput, and then calculates the scheduling priority of the user on the PRRB by using the updated information, and performs secondary scheduling on the user; when the system adopts the time domain interference coordination technology: the UPRB and the PRRB are respectively arranged on different subframes, so that the base station only needs to calculate the scheduling priority of the user on one resource of the UPRB or the PRRB according to the interference influence factor corresponding to each subframe, and schedules the user according to the priority.
Specifically, the calculation of the scheduling priority is specifically configured to calculate, by using the original priority of each UE in the scheduling queue of the current subframe one by one, the interference impact factor of the UE, so as to obtain the priority corresponding to the UE. After the interference influence factor is introduced into the priority calculation formula, if the interference influence factor of the user is large, the scheduling priority corresponding to the user on the UPRB is relatively reduced, and the scheduling priority on the PRRB is relatively improved.
The apparatus for scheduling resources provided in this embodiment includes: the system comprises an interference influence factor calculation module, a priority calculation module and a scheduling module; wherein:
and the interference influence factor calculation module is used for calculating the interference influence factor of the user according to the channel quality feedback information of the user and the definition of the interference hard factor, and sending the interference influence factor corresponding to the user to the priority calculation module.
And the priority calculating module is used for calculating the scheduling priorities of the users on the UPRB and the PRRB by combining the interference influence factors of the users sent from the interference influence factor calculating module with the original priorities of the users and sending the scheduling priorities to the corresponding scheduling modules. In a frequency domain interference coordination system, a base station needs two priority calculation modules, and the scheduling priority of a user on a UPRB (uplink packet radio bearer) and a PRRB (physical uplink radio bearer) is calculated in each subframe respectively; in the time domain interference coordination system, a base station only needs one priority calculation module, and according to the type of a subframe, different priority calculation methods are selectively adopted to calculate the scheduling priority of a user on a UPRB or a PRRB.
And the scheduling module is used for allocating resources to the users according to the priority information of the users sent by the corresponding priority calculation module. In the frequency domain interference coordination system, a base station needs two scheduling modules, and performs resource scheduling of the UPRB and the PRRB according to user priorities acquired from different priority calculation modules respectively. In the time domain interference coordination system, a base station only needs one scheduling module, and schedules users according to the user scheduling priorities acquired from the priority calculation module at different subframes.
Example 3
Fig. 2 is a schematic diagram of a frequency domain interference coordination system used in the present invention, specifically, different frequency band resources are divided from frequencies by base station resources and correspond to different multiplexing degrees, where a resource with a higher multiplexing degree belongs to a UPRB and a resource with a lower multiplexing degree belongs to a PRRB.
Fig. 3 is a schematic diagram of a time domain interference coordination system used in this embodiment, specifically, when the system adopts an elcic technique to configure an ABS subframe for a macro base station, resources scheduled by Low Power Nodes (LPNs) in a coverage area of the macro base station in the ABS belong to PRRBs, and resources scheduled by a conventional subframe belong to UPRBs;
when the system adopts FeICIC to configure PR-ABS for the macro base station, the resource scheduled by LPN in PR-ABS in the coverage of the macro base station belongs to PRRB, the resource scheduled by the conventional subframe belongs to UPRB, the opposite resource interference of the macro base station scheduled by PR-ABS belongs to UPRB, and the resource scheduled by the conventional subframe belongs to PRRB.
As shown in fig. 6, the resource scheduling method applied to the frequency domain interference coordination system in this embodiment includes the following steps:
step 600, mapping the uplink grant channel (UPRB) and the resource block allocation table (PRRB) CQI fed back by the user according to the adaptive criteria of the downlink (for example, table 1) to obtain the corresponding MCS, and obtaining the spectrum efficiency of the user on the UPRB and the PRRBAndthe unit is bit/cu.
TABLE 1
Step 601, the interference influence factor calculation module utilizes the average spectrum efficiency of each user on PRRB and URRBAndcalculating interference impact factors of usersAnd sending the interference influence factor obtained by calculation to a priority calculation module.
Step 602, the priority calculating module 1 calculates the scheduling priority of the user on the UPRB according to the user interference influence factor obtained from the interference influence factor calculating unit.
Specifically, the original user priority is calculated by using an original priority calculation formula, and then the scheduling priority of the user is calculated by using the interference influence factor and the original priority.
Step 603, sequencing the users according to the scheduling priority of the users on the UPRB, and sequentially allocating resources to the users;
specifically, the calculation method of the original priority is determined by actual conditions, the calculation methods of the scheduling priorities of different services are different according to the QoS requirements of the services, the calculation methods of the interference impact factor and the original priority are also determined by actual conditions, and the calculation methods may be division of the original priority by the interference impact factor or weighted summation of the original priority and the reciprocal of the interference impact factor, and the like.
Step 604, the scheduling module 1 sequentially allocates resources to the users according to the scheduling priorities of the users on the UPRB, and updates the service queue information of the users.
Specifically, in the scheduling process, after allocating a UPRB resource block to any user, it is necessary to evaluate the data amount that can be sent by the user using the resource block, and subtract the data transmission amount brought by the allocated resource from the data to be sent, and once the user allocates sufficient resources, the user will exit the contention of the remaining resources.
Step 605, according to the updated user queue information and average rate information, recalculating the original scheduling priority of the user in the PRRB, and then calculating the scheduling priority of the user by using the interference impact factor and the original priority.
Specifically, the calculation method of the original priority is determined by actual conditions, the calculation methods of the scheduling priorities of different services are different according to the QoS requirements of the services, and the calculation methods of the interference impact factor and the original priority are also determined by actual conditions, and may be multiplication of the original priority and the interference impact factor, or weighted summation of the original priority and the interference impact factor, and the like.
And 606, the scheduling module performs resource allocation on the users in sequence according to the scheduling priority of the users on the PRRB.
Specifically, in the scheduling process, after allocating a PRRB resource block to any user, the amount of data that can be transmitted by the user using the resource block needs to be evaluated, and the data transmission amount caused by the allocated resource is subtracted from the data to be transmitted, so that once the user allocates sufficient resources, the contention of the remaining resources is exited.
The resource allocation method described herein is the prior art and is only described briefly.
The resource scheduling method applicable to the time domain interference coordination system in this embodiment, as shown in fig. 7, includes the following steps:
step 700, mapping to obtain corresponding MCS according to the downlink adaptive criteria (for example, table 1) by using the CQI information fed back by the user on the sub-frame corresponding to the UPRB and the sub-frame corresponding to the PRRB, and obtaining the spectrum efficiency of the user on the UPRB and the PRRBZIAUAndthe unit is bit/cu.
Step 701, the interference impact factor calculation module utilizes the average spectral efficiency of each user over PRRB and URRBAndcalculating interference impact factors of usersAnd sending the interference influence factor obtained by calculation to a priority calculation module.
In step 702, the resource type determining module determines whether the resource type scheduled by the current subframe is a UPRB or a PRRB.
Specifically, for the LPN, if the current subframe is ABS or PR-ABS, the corresponding scheduling resource belongs to PRRB, otherwise it is UPRB; for the macro base station, the resource is divided into a UPRB and a PRRB only when PR-ABS configuration exists, if the current subframe is PR-ABS, the scheduling resource belongs to the UPRB, and if not, the scheduling resource belongs to the PRRB.
And 703, the priority calculating module selects a specific priority calculating mode according to the user interference influence factor obtained from the interference influence factor calculating element and the result obtained from the resource type judging unit, and calculates the priority of the current subframe user.
Specifically, an original priority calculation formula is used for calculating the original user priority, the scheduling priority calculation modes of different services are different according to the QoS requirements of the services, and then the user priority is calculated by combining interference influence factors.
Specifically, the interference impact factor and the original priority are calculated in a manner selected according to the resource type. If the resource scheduled corresponding to the current subframe belongs to the UPRB, dividing the original priority by the interference influence factor or performing weighted sum with the reciprocal of the interference influence factor, and the like; and if the resource scheduled corresponding to the current subframe belongs to the PRRB, multiplying the original priority by the interference influence factor, or calculating the weighted sum of the original priority and the interference influence factor.
Specifically, the calculation method considering the priority of interference depends on the actual situation, and the following criteria are required:
after the interference influence factor is introduced, the relative scheduling priority of the user with the larger interference influence factor on the PRRB will be increased, and the scheduling priority on the UPRB will be decreased.
Step 704, allocating resources to the user according to the service type of the user and the scheduling priority obtained from the priority calculating module.
Specifically, in the scheduling process, after allocating a resource block of the current subframe to any user, the amount of data that can be transmitted by the user using the resource block needs to be evaluated, and the data transmission amount brought by the allocated resource is subtracted from the data to be transmitted, so that once the user allocates sufficient resources, the contention of the remaining resources is exited.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered in the protection scope of the present invention.

Claims (3)

1. A method for scheduling radio resources for an interference coordination system, the method comprising: the method comprises the following steps:
the base station calculates the spectrum efficiency of the user on a high interference resource UPRB and a low interference resource PRRB by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the user channel quality;
respectively calculating the scheduling priority of the user on a high interference resource UPRB and a low interference resource PRRB according to the interference influence factor;
the interference influence factor IIFuIt is defined in the following way:wherein,corresponding spectrum efficiency of the user on the UPRB (uplink packet radio bearer);corresponding spectrum efficiency of the user on the low interference resource PRRB;
according to the scheduling priority and the user backlog data packet information of the user on the high interference resource UPRB and the low interference resource PRRB, respectively allocating the high interference resource UPRB and the low interference resource PRRB resources for the user;
the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB is calculated according to the following modes: when the system adopts a frequency domain interference coordination technology, the base station calculates the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates queue information and throughput information, then calculates the scheduling priority of the user on the PRRB by using the updated information, and carries out secondary scheduling on the user;
the scheduling priority is specifically calculated in the following manner: firstly, calculating the original user priority by using an original priority calculation formula, and then calculating the scheduling priority of the user by using the interference influence factor and the original priority; calculating the UPRB priority: dividing the original priority by the interference influence factor or performing weighted summation with the reciprocal of the interference influence factor; after scheduling UPRB resources, updating queue and throughput information of users, recalculating the original priority of the updated information, and calculating a new priority by combining the original priority and the interference influence factor; when calculating the priority of the user on the PPRB, multiplying the original priority by the interference influence factor, or performing weighted summation on the original priority and the interference influence factor; when the system adopts a time domain interference coordination technology, calculating the scheduling priority of the user on the UPRB or PRRB resource according to the interference influence factor, and scheduling the user according to the priority;
when the UPRB is scheduled at the current subframe, the calculated priority adopts the result of weighted summation of the original priority divided by the interference influence factor or the reciprocal of the interference influence factor; if the resource scheduled by the current subframe belongs to the PPRB, multiplying the original priority by the interference influence factor or performing weighted summation on the original priority and the interference influence factor when calculating the priority; the method comprises the following specific steps:
selecting a user with the highest current priority, and acquiring the data volume to be transmitted of the user as x bit and the spectral efficiency a bit/RB corresponding to the user, wherein if the UPRB is scheduled by a current subframe, the spectral efficiency is the spectral efficiency measured on the UPRB; if the PPRB is scheduled on the current subframe, the spectral efficiency is correspondingly measured on the PPRB;
estimating the resource quantity required by the user, if the maximum quantity of the resource blocks isA plurality of; randomly selecting a resource block for the user in the current resource; and then selecting the user with the second priority, allocating resources in the same way, and sequentially allocating the resources to the users according to the priority order until all the resources are allocated or all the users are allocated to the resources.
2. The method for scheduling of radio resources for an interference coordination system according to claim 1, characterized in that: the spectral efficiency on the high interference resource UPRB and on the low interference resource PRRB is calculated as follows:
when the PRRB and the URRB are divided from the frequency domain, the user feeds back the wideband CQI of the frequency band corresponding to the UPRB and the frequency band corresponding to the PRRB to the service base station in each TTI, and the spectral efficiency of the user in the URRB and the PRRB is estimated according to the downlink self-adaptive modulation coding principle in the 3GPP protocol;
when the PRRB and the URRB are divided from the time domain, the user feeds back the ABS and the broadband CQI corresponding to the conventional subframe, and the spectral efficiency on the resources of the corresponding PRRB and the URRB is obtained according to the downlink adaptive modulation and coding rule in the 3GPP protocol.
3. A radio resource scheduling apparatus for an interference coordination system, comprising: the scheduling method comprises a spectrum efficiency calculation module, a scheduling priority calculation module and a scheduling module;
the spectrum efficiency calculating module is used for calculating the spectrum efficiency of the user on a high interference resource UPRB and a low interference resource PRRB by utilizing a downlink self-adaptive modulation coding rule according to the feedback of the user channel quality by the base station;
the scheduling priority calculating module is used for calculating the scheduling priority of the user on the UPRB (uplink resource block) and the PRRB (low interference resource block) according to the interference influence factors;
the scheduling module is used for respectively allocating the high interference resource UPRB and the low interference resource PRRB resources for the user according to the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB and the user backlog data packet information;
the spectrum efficiency calculating module is configured to calculate the spectrum efficiency on the high interference resource UPRB and the low interference resource PRRB according to the following manner:
when the PRRB and the URRB are divided from the frequency domain, the user feeds back the wideband CQI of the frequency band corresponding to the UPRB and the frequency band corresponding to the PRRB to the service base station in each TTI, and the spectral efficiency of the user in the URRB and the PRRB is estimated according to the downlink self-adaptive modulation coding principle in the 3GPP protocol;
when the PRRB and the URRB are divided from the time domain, the user feeds back the broadband CQI corresponding to the ABS and the conventional subframe, and the frequency spectrum efficiency on the resources of the corresponding PRRB and the URRB is obtained according to the downlink adaptive modulation and coding rule in the 3GPP protocol;
the interference influence factor IIFuIt is defined in the following way:wherein,corresponding spectrum efficiency of the user on the UPRB (uplink packet radio bearer);corresponding spectrum efficiency of the user on the low interference resource PRRB;
the scheduling priority of the user on the high interference resource UPRB and the low interference resource PRRB is calculated according to the following modes:
when the system adopts a frequency domain interference coordination technology, the base station calculates the scheduling priority of the user on the UPRB, then schedules the user according to the scheduling priority of the user and updates queue information and throughput information, then calculates the scheduling priority of the user on the PRRB by using the updated information, and carries out secondary scheduling on the user;
the scheduling priority is specifically calculated in the following manner: firstly, calculating the original user priority by using an original priority calculation formula, and then calculating the scheduling priority of the user by using the interference influence factor and the original priority; calculating the UPRB priority: dividing the original priority by the interference influence factor or performing weighted summation with the reciprocal of the interference influence factor; after scheduling UPRB resources, updating queue and throughput information of users, recalculating the original priority of the updated information, and calculating a new priority by combining the original priority and the interference influence factor; when calculating the priority of the user on the PPRB, multiplying the original priority by the interference influence factor, or performing weighted summation on the original priority and the interference influence factor; when the system adopts a time domain interference coordination technology, calculating the scheduling priority of the user on the UPRB or PRRB resource according to the interference influence factor, and scheduling the user according to the priority;
when the UPRB is scheduled at the current subframe, the calculated priority adopts the result of weighted summation of the original priority divided by the interference influence factor or the reciprocal of the interference influence factor; if the resource scheduled by the current subframe belongs to the PPRB, multiplying the original priority by the interference influence factor or performing weighted summation on the original priority and the interference influence factor when calculating the priority; the method comprises the following specific steps:
selecting a user with the highest current priority, and acquiring the data volume to be transmitted of the user as x bit and the spectral efficiency a bit/RB corresponding to the user, wherein if the UPRB is scheduled by a current subframe, the spectral efficiency is the spectral efficiency measured on the UPRB; if the PPRB is scheduled on the current subframe, the spectral efficiency is correspondingly measured on the PPRB;
estimating the resource quantity required by the user, if the maximum quantity of the resource blocks isA plurality of; randomly selecting the user in the current resourceA resource block; and then selecting the user with the second priority, allocating resources in the same way, and sequentially allocating the resources to the users according to the priority order until all the resources are allocated or all the users are allocated to the resources.
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