CN110290588B - Method for allocating wireless channel resources - Google Patents

Method for allocating wireless channel resources Download PDF

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CN110290588B
CN110290588B CN201910373098.8A CN201910373098A CN110290588B CN 110290588 B CN110290588 B CN 110290588B CN 201910373098 A CN201910373098 A CN 201910373098A CN 110290588 B CN110290588 B CN 110290588B
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terminal
channel resources
wireless channel
radio channel
terminals
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CN110290588A (en
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郑伟军
方景辉
唐锦江
陈嵘
王文华
钱啸
吴国庆
邵炜平
杨鸿珍
黄红兵
汤亿则
钱伟杰
刘维亮
曾建梁
文科
张瑞兵
付海兵
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State Grid Corp of China SGCC
Potevio Information Technology Co Ltd
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Potevio Information Technology Co Ltd
Jiaxing Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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    • 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
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • 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
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention discloses a method for allocating wireless channel resources, which comprises the following steps: firstly, according to the principle of first applying for first allocation, radio channel resources are made, and when the radio channel resources are less than a set value, the radio channel resources are allocated through an automatic allocation mechanism; the automatic allocation mechanism comprises the following steps: step one, a base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource; step two, finding out the set of available wireless channel resources of a group of terminals in the available wireless channel resources; step three, preferentially allocating wireless channel resources to the terminals with less available wireless channel resources; and step four, selecting wireless channel resources with large estimated signal-to-noise ratio of the terminal.

Description

Method for allocating wireless channel resources
Technical Field
The present invention relates to a method of channel resource allocation, and more particularly, to a method of radio channel resource allocation.
Background
The state does not have to allocate 40 frequency bands with 25K bandwidth in a discrete distribution to the power system in 230M frequency band, and the power system is used by a wireless private network. Each band of 25K bandwidth is referred to as a radio channel resource.
In the power wireless private network, a base station manages a group of wireless channel resources, when a terminal needs to communicate, the base station firstly requests the base station to use the wireless channel resources, and the base station selects one wireless channel resource from the group of wireless channel resources managed by the base station to be allocated to the terminal for use; and after the terminal is used, the base station recovers the wireless channel resources. A plurality of terminals in the wireless private network share a group of wireless channels, and the wireless channel resources are reasonably allocated according to the service characteristics, so that the capacity of the system can be obviously improved.
The terminal service characteristics of the power network system are as follows: a terminal applies for and occupies a wireless channel resource each time; the traffic volume sent by each terminal is smaller, and a plurality of services can be transmitted within the time of one radio resource and one subframe, so that the time of occupying one radio channel resource is short; all terminals apply for channel resources at the same time; the service volumes of all terminals are consistent; the communication quality requirements of all terminals are the same; the time delay requirement of the data is strict; the existing radio channel allocation algorithms are:
and allocating the wireless channel resource algorithm purely by using the total throughput maximization criterion of the system. The method preferentially meets the requirements of terminals with good channel quality, and the terminals with poor channel quality allocate channels in a lagging way. The advantages are that: the system acquires the maximum throughput, which is insufficient: the communication delay of the terminal with poor channel quality may be large.
A polling algorithm. The algorithm allocates channels in turn, regardless of channel quality. The advantages are that: all terminals alternately allocate channels according to the time sequence of the application channels, and the method has the following defects: the radio channel resources allocated to a terminal do not enable the terminal to transmit traffic well, and even cause access failure, wasting the radio channel resources.
Proportional fair scheduling algorithm. The algorithm assigns a "high priority" to terminals with good channel quality, while increasing their priority if terminals with poor channel quality cannot be scheduled for a long time. The channel is preferentially allocated to the terminal with the higher priority. The advantages are that: the algorithm simultaneously considers fairness and system throughput, and has the defects that: terminals with poor channel quality still have a large time delay in the priority lifting process.
Disclosure of Invention
The invention aims to overcome the defect that a terminal cannot allocate radio channel resources later due to the fact that the channel quality of the terminal is much smaller than that of other terminals applying for radio channel resources under the condition that the current radio channel resource allocation algorithm can reach a demodulation threshold, and provides a method capable of guaranteeing that the terminal can be allocated to the radio channel resources rapidly under the condition that the terminal reaches the demodulation threshold, guaranteeing that the terminal is allocated to the radio channel resources under a short delay, and guaranteeing that the terminal is allocated to more reasonable radio channel resources by adopting a system throughput maximization criterion under the premise.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for allocating wireless channel resources includes firstly, making wireless channel resources according to the principle of first applying for first allocation, and allocating wireless channel resources through an automatic allocation mechanism when the wireless channel resources are less than a set value; the automatic allocation mechanism comprises the following steps:
step one, a base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource;
step two, finding out the set of available wireless channel resources of a group of terminals in the available wireless channel resources;
step three, preferentially allocating wireless channel resources to the terminals with less available wireless channel resources;
and step four, selecting wireless channel resources with large estimated signal-to-noise ratio of the terminal.
According to the characteristics of the power network terminal service, the invention provides a wireless channel resource allocation algorithm, which can ensure that the terminal can be rapidly allocated to wireless channel resources under the condition that the terminal reaches a demodulation threshold, ensure that the terminal is allocated to the wireless channel resources under a short delay, and simultaneously adopt a system throughput maximization criterion under the premise to ensure that the terminal is allocated to more reasonable wireless channel resources.
Preferably, in the first step, the base station calculates the background noise of all wireless channel resources and continuously updates the background noise in the working process;
in the power system, each terminal has a certain valuePeriodically, scanning all wireless channel resources to obtain path loss values of the wireless channel resources, and recording the path loss values as
Figure BDA0002050685240000031
K is the number of all wireless channel resources, u is the index of the terminal, and report to the base station;
the base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource before the wireless channel resource allocation:
Figure BDA0002050685240000032
s in the above u Is the maximum transmit signal power for user u.
Preferably, in the second step,
finding a set of available radio channel resources for a group of terminals among the available radio channel resources; in a certain time period, the wireless channel resources which can be allocated form a queue, which is marked as Qf and has the length of N; in the period, preparing a terminal applying for wireless channel resources, forming a queue, namely Qu0, and marking the length as M;
the first N terminals are taken out from the terminal queue Qu0 according to the first-in first-out principle, the queue with the length of N is marked as Qu1, and the member of Qu1 is terminal u n (n=0, 1,..n-1), the ordering of N being in ascending order according to the chronological order in which the radio channel resources are applied;
terminal u n In radio channel resource f i Upper part of the cylinder
Figure BDA0002050685240000045
Compare with demodulation threshold if +.>
Figure BDA0002050685240000046
If the radio channel resource is smaller than the demodulation threshold, judging that the radio channel resource is not available for the terminal; otherwise, it is available; the demodulation threshold is the theoretical value of the minimum signal-to-noise ratio of the service which can be made by the terminal;
in wireless communicationIn the channel resource queue Qf, the number of available channels per terminal in the Qu1 queue of the terminal applying for radio channel resources is obtained and recorded as
Figure BDA0002050685240000041
Preferably, in the second step, the SNR threshold is the same value because of the same demodulation capability of each terminal in the power network system.
Preferably, in the third step, the terminal u in Qu1 n (n=0, 1,..n-1), the terminal u with the least number of available radio channel resources is found x I.e.
Figure BDA0002050685240000042
If terminal u x Number of available radio channel resources of (a)
Figure BDA0002050685240000043
The terminal does not allocate a channel; if multiple terminals have the same number of channels available,
Figure BDA0002050685240000044
take the terminal x=min (xk) that is located earlier in the queue. Preferably, in the fourth step, the terminal u x In (I)>
Figure BDA0002050685240000051
Radio channel resources above demodulation threshold
Figure BDA0002050685240000052
Finding +.>
Figure BDA0002050685240000053
Namely: let u be x Channel f achieving maximum signal-to-noise ratio x Assigned to the terminal.
Preferably, the setting value in the case that the radio channel resource is less than the setting value is a setting value adjusted manually or automatically in real time.
Therefore, the invention has the following beneficial effects: according to the characteristics of the power network terminal service, the invention provides a wireless channel resource allocation algorithm, which can ensure that the terminal can be rapidly allocated to wireless channel resources under the condition that the terminal reaches a demodulation threshold, ensure that the terminal is allocated to the wireless channel resources under a short delay, and simultaneously adopt a system throughput maximization criterion under the premise to ensure that the terminal is allocated to more reasonable wireless channel resources.
Drawings
FIG. 1 is a basic flow diagram of the present invention;
fig. 2 is a detailed flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
A method for allocating wireless channel resources (see figures 1 and 2), firstly, making wireless channel resources according to the principle of first applying and first allocating, and when the wireless channel resources are less than a set value, allocating the wireless channel resources through an automatic allocation mechanism; the automatic allocation mechanism comprises the following steps:
step one, a base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource;
step two, finding out the set of available wireless channel resources of a group of terminals in the available wireless channel resources;
step three, preferentially allocating wireless channel resources to the terminals with less available wireless channel resources;
and step four, selecting wireless channel resources with large estimated signal-to-noise ratio of the terminal.
In the first step, the base station calculates the background noise of all wireless channel resources and continuously updates the background noise in the working process;
in the power system, each terminal scans all wireless channel resources at a certain period to obtain its own path loss value under each wireless channel resource, and records it as
Figure BDA0002050685240000061
K is the number of all wireless channel resources, u is the index of the terminal, andreporting to a base station;
the base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource before the wireless channel resource allocation:
Figure BDA0002050685240000062
s in the above u Is the maximum transmit signal power for user u.
In the second step, the first step is performed,
finding a set of available radio channel resources for a group of terminals among the available radio channel resources; in a certain time period, the wireless channel resources which can be allocated form a queue, which is marked as Qf and has the length of N; in the period, preparing a terminal applying for wireless channel resources, forming a queue, namely Qu0, and marking the length as M;
the first N terminals are taken out from the terminal queue Qu0 according to the first-in first-out principle, the queue with the length of N is marked as Qu1, and the member of Qu1 is terminal u n (n=0, 1,..n-1), the ordering of N being in ascending order according to the chronological order in which the radio channel resources are applied;
terminal u n In radio channel resource f i Upper part of the cylinder
Figure BDA0002050685240000063
Compare with demodulation threshold if +.>
Figure BDA0002050685240000071
If the radio channel resource is smaller than the demodulation threshold, judging that the radio channel resource is not available for the terminal; otherwise, it is available; the demodulation threshold is the theoretical value of the minimum signal-to-noise ratio of the service which can be made by the terminal;
in the radio channel resource queue Qf, the number of available channels per terminal in the Qu1 queue of the terminal applying for radio channel resources is obtained and recorded as
Figure BDA0002050685240000072
In the second step, because of the power network system, the demodulation capability of each terminal is the same, and the SNR threshold is the same value.
In the third step, terminal u in Qu1 n (n=0, 1,..n-1), the terminal u with the least number of available radio channel resources is found x I.e.
Figure BDA0002050685240000073
If terminal u x Is>
Figure BDA0002050685240000074
The terminal does not allocate a channel; if multiple terminals have the same number of channels available,
Figure BDA0002050685240000075
take the terminal x=min (xk) that is located earlier in the queue.
In the fourth step, the terminal u x In the process,
Figure BDA0002050685240000076
radio channel resources greater than demodulation threshold are +.>
Figure BDA0002050685240000077
Finding
Figure BDA0002050685240000078
Namely: let u be x Channel f achieving maximum signal-to-noise ratio x Assigned to the terminal.
According to the characteristics of the power network terminal service, the embodiment provides a wireless channel resource allocation algorithm, which can ensure that the terminal can be rapidly allocated to wireless channel resources under the condition that the terminal reaches a demodulation threshold, ensure that the terminal is allocated to the wireless channel resources under a short delay, and simultaneously adopt a system throughput maximization criterion under the premise to ensure that the terminal is allocated to more reasonable wireless channel resources.
It should be understood that the examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.

Claims (7)

1. A method for allocating wireless channel resources includes firstly, making wireless channel resources according to the principle of first applying for first allocation, and allocating wireless channel resources through an automatic allocation mechanism when the wireless channel resources are less than a set value; wherein the automatic allocation mechanism comprises the steps of:
step one, a base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource;
preparing terminals applying for wireless channel resources to form a queue, taking out the first N terminals from the terminal queue according to the first-in first-out principle, comparing the SNR threshold and the demodulation threshold of the terminals of the wireless channel resources, and finding out a set of available wireless channel resources of a group of terminals from the available wireless channel resources;
step three, preferentially allocating wireless channel resources to the terminals with less available wireless channel resources;
and step four, selecting wireless channel resources with large estimated signal-to-noise ratio of the terminal.
2. The method according to claim 1, wherein in the first step, the base station calculates the background noise of all the radio channel resources and continuously updates the background noise during operation; in the power system, each terminal scans all wireless channel resources at a certain period to obtain its own path loss value under each wireless channel resource, and records it as
Figure FDA0004142244500000011
Figure FDA0004142244500000012
K is the number of all wireless channel resources, u is the index of the terminal, and report to the base station;
the base station estimates the signal-to-noise ratio of each terminal in each wireless channel resource before the wireless channel resource allocation:
Figure FDA0004142244500000013
s in the above u For the maximum transmit signal power for user u,
Figure FDA0004142244500000014
for radio channel resource f i Number of channels available.
3. The method of claim 1, wherein in the second step,
finding a set of available radio channel resources for a group of terminals among the available radio channel resources;
in a certain time period, the wireless channel resources which can be allocated form a queue, which is marked as Qf and has the length of N; the terminals which are ready to apply for wireless channel resources in the period form a queue, which is marked as Qu0 and the length is marked as M; the first N terminals are taken out from the terminal queue Qu0 according to the first-in first-out principle, the queue with the length of N is marked as Qu1, and the member of Qu1 is terminal u n (n=0, 1,..n-1), the ordering of N being in ascending order according to the chronological order in which the radio channel resources are applied; terminal u n In radio channel resource f i Upper part of the cylinder
Figure FDA0004142244500000021
Compare with demodulation threshold if +.>
Figure FDA0004142244500000022
If the radio channel resource is smaller than the demodulation threshold, judging that the radio channel resource is not available for the terminal; otherwise, the method is available; the demodulation threshold is the theoretical value of the minimum signal-to-noise ratio of the service which can be made by the terminal; in the radio channel resource queue Qf, the availability of each terminal in the Qu1 queue of the terminal applying for radio channel resources is obtainedChannel number, recorded as->
Figure FDA0004142244500000023
Figure FDA0004142244500000024
For radio channel resource f i Terminal u of (2) n Is set for the SNR threshold of (c).
4. A method for allocating radio channel resources according to claim 3, wherein in said step two, the SNR threshold is the same value because of the same demodulation capability of each terminal in the power network system.
5. The method of wireless channel resource allocation according to claim 3, wherein in said step three, the terminal u in Qu1 n (n=0, 1,..n-1), the terminal u with the least number of available radio channel resources is found x I.e.
Figure FDA0004142244500000025
If terminal u x Is>
Figure FDA0004142244500000026
The terminal does not allocate a channel; if multiple terminals have the same number of channels available, and (2)>
Figure FDA0004142244500000027
Taking the terminal x=min (xk) in front of the queue, xk is the corner mark value for distinguishing different terminals.
6. A method for allocating radio channel resources according to claim 3, wherein in said step four, terminal u x In the process,
Figure FDA0004142244500000031
radio channel resources greater than demodulation threshold are +.>
Figure FDA0004142244500000032
Finding +.>
Figure FDA0004142244500000033
Namely: let u be x Channel f achieving maximum signal-to-noise ratio x Assigned to the terminal.
7. The method of claim 1, wherein the set value in the case where the radio channel resources are less than the set value is a set value adjusted manually or automatically in real time.
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