CN110022599A - A kind of downlink power control, accidental access method and device - Google Patents

A kind of downlink power control, accidental access method and device Download PDF

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Publication number
CN110022599A
CN110022599A CN201810015575.9A CN201810015575A CN110022599A CN 110022599 A CN110022599 A CN 110022599A CN 201810015575 A CN201810015575 A CN 201810015575A CN 110022599 A CN110022599 A CN 110022599A
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CN
China
Prior art keywords
terminal
cell
downlink channel
transmitting power
time unit
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CN201810015575.9A
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Chinese (zh)
Inventor
韩冰
刘华玲
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Priority to CN201810015575.9A priority Critical patent/CN110022599A/en
Publication of CN110022599A publication Critical patent/CN110022599A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another 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
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

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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

This application discloses a kind of downlink power control, accidental access method and devices.In method for controlling downlink power provided by the present application, base station determines down channel transmission power according to down channel transmission power rule change, and according to the down channel transmission power, the information of the down channel carrying is sent by the down channel；When cell is in the time quantum of high transmitting power, edge termination in cell described in the base station priority scheduling, when cell is in the time quantum of low transmitting power, the non-edge terminal in the cell is only dispatched in the base station.Wherein, the down channel transmission power of a cell changes over time, and a cell is not high transmitting power in down channel transmission power mutually in the same time at least one adjacent area in its adjacent area simultaneously.The application can reduce adjacent area interference.

Description

Downlink power control and random access method and device
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a downlink power control method and apparatus, and a random access method and apparatus.
Background
The cellular-based narrowband Internet of Things (NB-IoT) generally adopts low-Frequency Band networking, and the inter-site distance is slightly larger than Long Term Evolution (LTE), but with network development in the future, the inter-site distance may reach an inter-site distance equivalent to that of a Frequency Division Duplex (FDD) LTE network.
In the current NB-IoT network, NB-IoT Reference Signal (NRS) power of a cell is fixed, and all downlink channel power can be considered to be fixed because other downlink channel (control channel and traffic channel) power is fixedly biased with respect to the NRS power. In the border zone of the boundary between cells, the NRS of the neighboring cell will cause severe interference to the cell.
In the wireless cellular networking structure shown in fig. 1, when the terminal is located at the edge of a cell (e.g., the terminal is located at the edge of a cell a1 in fig. 1), the Signal to interference plus Noise Ratio (SINR) of the terminal is lower than 0dB, even lower than-3 dB, due to interference of NRS and traffic channels in the surrounding neighboring cells, which seriously affects the receiving performance. Even if NB-IoT cells repeat transmission several times downstream, the terminal may still not receive data correctly. Moreover, since the NB-IoT system operates in a single Physical Resource Block (PRB) bandwidth, NRS in the neighboring cell will have a serious influence on the traffic channel of the cell, which results in a reduction in transmission efficiency of edge users, thereby affecting the carrying capacity of the cell.
Therefore, how to reduce the interference of the neighboring cells is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The embodiment of the application provides downlink power control and a device, which are used for reducing adjacent cell interference.
In a first aspect, a method for controlling downlink power is provided, where the method includes:
the base station determines the transmitting power of the downlink channel according to the transmitting power change rule of the downlink channel; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time;
and the base station sends the information carried by the downlink channel through the downlink channel according to the downlink channel transmitting power.
Optionally, according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies periodically, where a period includes a first time unit, a second time unit, and a third time unit, where the downlink channel transmission power in at least 2 time units is different; the PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
Optionally, the method further comprises: when a cell is in a time unit with high transmitting power, the base station preferentially schedules an edge terminal in the cell; or, when the cell is in a time unit with low transmission power, the base station only schedules the non-edge terminal in the cell.
Optionally, the method further comprises: and the base station informs the terminal of the downlink channel transmitting power change rule.
Optionally, the method further comprises: the base station receives the downlink path loss reported by the terminal; and the base station determines a group where the terminal is located according to the downlink path loss reported by the terminal and a path loss threshold value, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
Optionally, the method further comprises: the base station sends the path loss threshold value to the terminal; and the base station receives a group where the terminal is located, which is determined by the terminal according to the path loss threshold value and the downlink path loss measured by the terminal, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
Optionally, the downlink channel includes: at least one of an NRS channel, a downlink control channel, and a downlink traffic channel.
In a second aspect, a base station is provided, which includes:
the power determining module is used for determining the transmitting power of the downlink channel according to the transmitting power change rule of the downlink channel; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time;
and the sending module is used for sending the information carried by the downlink channel through the downlink channel according to the downlink channel sending power.
Optionally, the base station further includes: the scheduling module is used for preferentially scheduling the edge terminal in the cell when the cell is in the time unit with high transmitting power; or, when the cell is in a time unit with low transmission power, only the non-edge terminal in the cell is scheduled.
In a third aspect, a base station is provided, which includes: the device comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are connected through a bus. The processor is configured to read a program in the memory and execute the method according to any one of the first aspect.
In a fourth aspect, there is provided a computer storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the first aspects above.
In the above embodiments of the present application, the base station determines the downlink channel transmission power according to a downlink channel transmission power variation rule, and sends the information carried by the downlink channel through the downlink channel according to the downlink channel transmission power. The method introduces a downlink channel transmitting power change rule, according to the rule, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of a cell and at least one adjacent cell in the adjacent cells is not high transmitting power at the same time, so that the downlink channel transmitting power is not fixed compared with the prior art, and the downlink channel transmitting power of the adjacent cells is not high transmitting power at the same time, thereby reducing the probability of generating adjacent cell interference.
The embodiment of the application also provides a random access method and a random access device.
In a fifth aspect, a random access method is provided, and the method includes:
the terminal determines the random access time of the terminal according to the downlink channel transmitting power change rule and the grouping of the terminal; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
and the terminal initiates random access according to the random access opportunity of the terminal.
Optionally, according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies periodically, where a period includes a first time unit, a second time unit, and a third time unit, where the downlink channel transmission power in at least 2 time units is different; the PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
Optionally, the determining, by the terminal, a random access time of the terminal according to the downlink channel transmit power variation rule and the group in which the terminal is located includes: if the terminal determines that the cell where the terminal is located is in a time unit with high transmitting power according to the downlink channel transmitting power change rule and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or, if the terminal determines that the cell where the terminal is located is in the time unit with low transmission power according to the downlink channel transmission power variation rule, and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
Optionally, the method further comprises: and the terminal receives the downlink channel transmitting power change rule sent by the base station.
Optionally, the method further comprises: the terminal reports the measured downlink path loss to the base station; and the terminal receives the group where the terminal is located, which is determined by the base station according to the downlink path loss and the path loss threshold value.
Optionally, the method further comprises: the terminal receives a path loss threshold value sent by a base station; and the terminal determines the grouping of the terminal according to the path loss threshold value and the downlink path loss measured by the terminal.
In a sixth aspect, a terminal is provided, which includes:
a determining module, configured to determine a random access time of the terminal according to a downlink channel transmit power variation rule and a group in which the terminal is located; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
and the random access module is used for initiating random access according to the random access opportunity of the terminal.
Optionally, the determining module is specifically configured to: if the cell where the terminal is located is determined to be in a time unit with high transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or, if the cell where the terminal is located is determined to be in a time unit with low transmission power according to the downlink channel transmission power change rule, and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
In a seventh aspect, a terminal is provided, including: the system comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are connected through a bus; the processor is configured to read a program in the memory and execute the method of any one of the above fifth aspects.
In an eighth aspect, there is provided a computer storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the above fifth aspects.
In the embodiment of the application, the terminal determines the random access time of the terminal according to the downlink channel transmission power change rule and the group where the terminal is located, and initiates random access according to the random access time of the terminal; the grouping includes at least a group of edge terminal users and a group of non-edge terminal users. The method comprises the steps of introducing a downlink channel transmitting power change rule, wherein according to the rule, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells is not high at the same time. Therefore, on one hand, the downlink channel transmitting power is not fixed and unchanged compared with the prior art, and the downlink channel transmitting power of the adjacent cell is probably not high transmitting power at the same time, so that the probability of generating adjacent cell interference can be reduced, and on the other hand, the terminal can select to initiate random access at a proper time according to the downlink channel transmitting power change rule and the grouping where the terminal is located.
Drawings
Fig. 1 is a schematic diagram of a cellular networking structure of a mobile network in the prior art;
fig. 2 is a schematic diagram of a downlink power control process provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a random access procedure according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a base station according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a terminal according to another embodiment of the present application.
Detailed Description
Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.
(1) In the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning.
(2) In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.
(3) "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The embodiment of the application provides a downlink power control scheme, which can adjust the transmitting power of a downlink channel according to time change, so that a cell presents a breathing effect of power scaling, interference between adjacent cells can be dynamically changed, and the bearing capacity of the cell and the transmission efficiency of the cell edge are improved.
The embodiment of the application can be applied to NB-IoT networks. In the following, an NB-IoT network is taken as an example to describe embodiments of the present application, where a base station involved in the embodiments is a base station in the NB-IoT network, and a terminal is a terminal in the NB-IoT network. Generally, in an NB-IoT network, small data traffic is transmitted between a base station and a terminal, and inter-cell handover is not required.
In the embodiment of the application, a downlink channel transmitting power change rule is introduced as a basis for downlink power control. According to the downlink channel transmitting power change rule, the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time. The downlink channel transmission power of a cell may vary within a range with time, or different transmission powers may be used in different time periods. According to a possible value or a value interval of the downlink channel transmission power of a cell, the downlink channel transmission power of the cell can be divided into high transmission power and low transmission power.
Optionally, the downlink channel transmit power of a cell may vary periodically according to the downlink channel transmit power variation rule.
Optionally, the downlink channel transmit power variation rule may be set according to a Physical Cell Identifier (PCI) modulus value, so as to reduce the probability of high transmit power in neighboring cells at the same time as much as possible. Currently, when the PCI of a cell is planned, PCI allocation is performed according to the modulus of PCI pair 3, so that neighboring cells avoid PCI collision (i.e. the same PCI is used) or PCI modulus 3 collision (i.e. the moduli of PCI pair 3 are the same) as much as possible. In the embodiment of the present application, a period may be divided into a first time unit, a second time unit, and a third time unit, where 3 time units are not overlapped and are continuously distributed, the downlink channel transmission power in each time unit is the same, and the downlink channel transmission power in at least 2 time units is different. One time unit may be a plurality of radio frames, and accordingly, one time unit may be represented by frame numbers of the plurality of radio frames. For example, a period may include 1024 wireless frames (frame numbers 0 to 1023), the frame number corresponding to the first time unit is 0 to 339, the frame number corresponding to the second time unit is 340 to 680, and the frame number corresponding to the third time unit is 681 to 1023.
According to the downlink channel transmitting power change rule, the cell PCI and the cell with the module value of 3 equal to 0 are in higher downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in higher downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in higher downlink channel transmitting power in a third time unit in one period.
For example, in a cell with a module value of PCI and 3 equal to 0, in a radio frame with a frame number of 0-339 (i.e., in a first time unit), the downlink channel transmit power is 15dBm, and in other frames in the period, the downlink channel transmit power is 12 dBm; in the cell with the module value of PCI and 3 equal to 1, in the wireless frame with the frame number of 340-680 (namely the second time unit), the transmitting power of the downlink channel is 15dBm, and in other frames in the period, the transmitting power of the downlink channel is 12 dBm; in the cell with the PCI and the module value of 3 equal to 2, the downlink channel transmission power is 15dBm in the radio frame with the frame number of 680-1023 (i.e. the third time unit), and the downlink channel transmission power is 12dBm in other frames in the period.
When PCI is allocated, the moduli of PCI pairs 3 of adjacent 3 cells are different, and the cells with different moduli are at higher downlink channel transmitting power in different time periods in a period, so that the time of high transmitting power between the adjacent cells is staggered, and the interference of the adjacent cells can be reduced.
It should be noted that the downlink channel transmission power of different cells may be configured differently. For example, in a cell with a module value of PCI and 3 equal to 0, in a radio frame with a frame number of 0-339 (i.e. in the first time unit), the downlink channel transmit power is 15dBm, and in other frames in the period, the downlink channel transmit power is 10 dBm; in the cell with the module value of PCI and 3 equal to 1, in the wireless frame with the frame number of 340-680 (namely the second time unit), the transmitting power of the downlink channel is 14dBm, and in other frames in the period, the transmitting power of the downlink channel is 12 dBm; in the cell with the PCI and the module value of 3 equal to 2, the downlink channel transmission power is 15dBm in the radio frame with the frame number of 680-1023 (i.e. the third time unit), and the downlink channel transmission power is 11dBm in other frames in the period.
Optionally, the downlink channel transmit power variation rule in this embodiment may be predetermined or preconfigured.
Optionally, in this embodiment of the present application, the base station may notify the terminal of the downlink channel transmission power change rule, and the terminal may select a suitable time to initiate random access according to the downlink channel transmission power change rule. Alternatively, the base station may notify the terminal of the downlink channel transmission power change rule through a broadcast message.
Optionally, the downlink channel related in this embodiment may be at least one of an NRS channel, a downlink control channel, and a downlink traffic channel. The transmission power of the downlink control channel and/or the downlink traffic channel may be obtained by performing a fixed offset with reference to the transmission power of the NRS channel.
The following describes a downlink power control method and a random access method provided in the embodiments of the present application, respectively, with reference to the accompanying drawings.
Referring to fig. 2, a schematic diagram of a downlink power control process provided in the embodiment of the present application is shown, where the process may include:
s201: and the base station determines the transmitting power of the downlink channel according to the transmitting power change rule of the downlink channel.
The downlink channel transmit power variation rule may refer to the foregoing description, and is not repeated here.
S202: and the base station sends the information carried by the downlink channel through the downlink channel according to the determined transmission power of the downlink channel.
Optionally, the base station may also combine downlink channel transmit power control with scheduling to improve downlink SINR at a cell edge when performing multi-cell networking, so as to improve the bearing efficiency and capacity of a cell.
In a case that the downlink channel transmission power of a cell is divided into a high transmission power and a low transmission power, as an example, the embodiment of the present application may further include the following steps: when the cell is in a time unit with high transmitting power, the base station preferentially schedules the edge terminal in the cell; as another example, the embodiments of the present application may further include the steps of: when a cell is in a time unit of low transmit power, the base station may schedule only non-edge terminals in the cell. When the cell is in the time unit with high transmitting power, the transmission success rate of the cell edge terminal is higher, so the cell edge terminal is scheduled preferentially, and the transmission of the cell edge terminal can be ensured as much as possible. When the cell is in the time unit with low transmitting power, the transmission success rate of the cell edge terminal is low, so that only the non-cell edge terminal is scheduled at the time, and the bearing efficiency and the capacity of the cell can be improved as much as possible.
In the embodiment of the application, the terminals can be grouped according to whether the terminals are located at the edge of the cell, for example, the terminals can be divided into an edge terminal user group and a non-edge terminal user group. The grouping basis can be downlink path loss, if the downlink path loss of the terminal is greater than or equal to a set path loss threshold value, the terminal can be divided into edge terminal user groups, and if the downlink path loss of the terminal is less than the set path loss threshold value, the terminal can be divided into non-edge terminal user groups.
The terminals may be grouped by the base station or the terminal may determine the grouping in which it is located.
In one example where the terminals are grouped by the base station, the terminals measure the downlink path loss and transmit the measurement results to the base station. And the base station receives the downlink path loss reported by the terminal and determines the grouping of the terminal according to the downlink path loss and a path loss threshold value.
In an example of determining the packet where the terminal is located by the terminal, the base station sends the path loss threshold value to the terminal, so that the terminal determines the packet where the terminal is located according to the measured downlink path loss and the path loss threshold value, and sends the packet information to the base station.
When the embodiment of the application is applied to an NB-IoT network, the terminals in the network do not move or require inter-cell handover generally, so the terminal grouping situation is relatively stable. Terminals may be grouped when they access a network.
Optionally, the embodiment of the present application may further include the following steps: and the base station informs the terminal of the change rule of the downlink channel transmitting power. The terminal can select a proper time to perform random access according to the downlink channel transmission power change rule.
As an example, the downlink channel transmission power variation rule defines: in the cell with the module value of the PCI and 3 of the cell being equal to 0, the transmitting power of the downlink channel is 15dBm in the wireless frame with the frame number of 0-339, and the transmitting power of the downlink channel is 12dBm in other frames in the period; in the cell with the module value of PCI and 3 equal to 1, the transmitting power of the downlink channel is 15dBm in the wireless frame with the frame number of 340-680, and the transmitting power of the downlink channel is 12dBm in other frames in the period; and in the cell with the PCI and the module value of 3 equal to 2, the transmitting power of the downlink channel is 15dBm in the radio frame with the frame number of 681-1023, and the transmitting power of the downlink channel is 12dBm in other frames in the period. The downlink channel transmission power variation rule can be expressed as:
(PCI mod 3)＝0：[(15,12),0,339]
(PCI mod 3)＝1：[(15,12),340,680]
(PCI mod 3)＝2：[(15,12),681,1023]
the embodiment of the present application does not limit the method for representing the downlink channel transmission power change rule.
As can be seen from the above description, in the above embodiments of the present application, the base station determines the downlink channel transmission power according to the downlink channel transmission power variation rule, and sends the information carried by the downlink channel through the downlink channel according to the downlink channel transmission power. The method introduces a downlink channel transmitting power change rule, according to the rule, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of a cell and at least one adjacent cell in the adjacent cells is not the higher transmitting power at the same time, so that the downlink channel transmitting power is not fixed compared with the prior art, and the downlink channel transmitting power of the adjacent cells is probably not the higher transmitting power at the same time, thereby reducing the probability of generating adjacent cell interference.
Referring to fig. 3, a schematic diagram of a random access procedure provided in the embodiment of the present application is shown, where the procedure may include:
s301: and the terminal determines the random access time of the terminal according to the downlink channel transmitting power change rule and the grouping of the terminal.
Wherein the grouping comprises at least an edge end user group and a non-edge end user group. The method for grouping the terminals can be referred to the description of the foregoing embodiments, and will not be repeated here.
The downlink channel transmit power variation rule may refer to the foregoing description, and is not repeated here.
The downlink channel transmission power of a cell is divided into a high transmission power and a low transmission power. Optionally, in this step, if the terminal determines, according to the downlink channel transmission power variation rule, that the cell in which the terminal is located is in the time unit with high transmission power, and the group in which the terminal is located is the edge terminal user group, it is determined that random access is initiated in the time unit. Therefore, the transmission success rate of the terminal with larger path loss when the downlink channel transmitting power is larger is higher than that when the downlink channel transmitting power is smaller, so that the random access process is initiated at the moment, and the terminal can be ensured to be accessed into the network as far as possible.
Optionally, in this step, if the terminal determines, according to the downlink channel transmission power variation rule, that the cell in which the terminal is located is in the time unit with low transmission power, and the group in which the terminal is located is a non-edge terminal user group, it is determined to initiate random access in the time unit. Because the interference of the terminal with smaller path loss by the neighboring cell is smaller than that of the terminal with larger path loss, the transmission success rate can be ensured when the transmitting power of the downlink channel is smaller, and therefore, a random access process is initiated at the moment, and a certain success rate can be ensured.
S302: and the terminal initiates random access according to the determined random access time.
As can be seen from the above description, in the above embodiments of the present application, the terminal determines the random access time of the terminal according to the downlink channel transmission power variation rule and the group in which the terminal is located, and initiates random access according to the random access time of the terminal. The method comprises the steps of introducing a downlink channel transmitting power change rule, wherein according to the rule, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells is not higher than the transmitting power of the cell at the same time. Therefore, on one hand, the downlink channel transmitting power is not fixed and unchanged compared with the prior art, and the downlink channel transmitting power of the adjacent cell is probably not higher than the transmitting power at the same time, so that the probability of generating adjacent cell interference can be reduced, and on the other hand, the terminal can select to initiate random access at a proper time according to the downlink channel transmitting power change rule and the grouping where the terminal is located, so as to improve the random access success rate as much as possible.
Based on the same technical concept, the embodiment of the application also provides a base station, and the base station can realize the function of the base station side in the embodiment.
Referring to fig. 4, a schematic structural diagram of a base station provided in the embodiment of the present application is shown, where the base station may include: a power determining module 401 and a sending module 402, wherein:
a power determining module 41, configured to determine downlink channel transmit power according to a downlink channel transmit power variation rule; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time;
a sending module 402, configured to send, according to the downlink channel transmission power, information carried by the downlink channel through the downlink channel.
Optionally, the base station may further include a scheduling module 403. The scheduling module 403 is configured to preferentially schedule an edge terminal in a cell when the cell is in a time unit with high transmission power; or, when the cell is in a time unit with low transmission power, only the non-edge terminal in the cell is scheduled.
Optionally, according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies periodically, where a period includes a first time unit, a second time unit, and a third time unit, where the downlink channel transmission power in at least 2 time units is different; the PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
Based on the same technical concept, the embodiment of the present application further provides a terminal, and the terminal can implement the functions of the terminal side in the foregoing embodiments.
Referring to fig. 5, a schematic structural diagram of a terminal provided in the embodiment of the present application is shown, where the terminal may include: a determining module 501 and a random access module 502, wherein:
a determining module 501, configured to determine a random access time of the terminal according to a downlink channel transmit power change rule and a group in which the terminal is located; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
a random access module 502, configured to initiate random access according to a random access opportunity of the terminal.
Optionally, the determining module 501 may be specifically configured to: if the cell where the terminal is located is determined to be in a time unit with high transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or, if the cell where the terminal is located is determined to be in a time unit with low transmission power according to the downlink channel transmission power change rule, and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
Optionally, according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies periodically, where a period includes a first time unit, a second time unit, and a third time unit, where the downlink channel transmission power in at least 2 time units is different; the PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
Based on the same technical concept, the embodiment of the present application further provides a base station, and the communication device can implement the functions of the base station side in the foregoing embodiments.
Referring to fig. 6, a schematic structural diagram of a base station provided in the embodiment of the present application is shown, where the base station may include: a processor 601, a memory 602, a transceiver 603, and a bus interface.
The processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 may store data used by the processor 601 in performing operations. The transceiver 603 is used for receiving and transmitting data under the control of the processor 601.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 601, and various circuits of memory, represented by memory 602, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 may store data used by the processor 601 in performing operations.
The process disclosed by the embodiment of the invention can be applied to the processor 601 or implemented by the processor 601. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 601. The processor 601 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the signal processing flow in combination with the hardware thereof.
Specifically, the processor 601 is configured to read the program in the memory 602 and execute: determining the downlink channel transmitting power according to a downlink channel transmitting power change rule, wherein the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high transmitting power at the same time. The transceiver 603 is configured to send, according to the downlink channel transmission power, information carried by the downlink channel through the downlink channel.
Based on the same technical concept, the embodiment of the present application further provides a terminal, and the communication device can implement the functions of the terminal side in the foregoing embodiments.
Referring to fig. 7, a schematic structural diagram of a terminal provided in the embodiment of the present application is shown, where the terminal may include: a processor 701, a memory 702, a transceiver 703, and a bus interface.
The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 in performing operations. The transceiver 703 is used for receiving and transmitting data under the control of the processor 701.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 702, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 in performing operations.
The process disclosed in the embodiments of the present invention may be applied to the processor 701, or implemented by the processor 701. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 701. The processor 701 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702 and completes the steps of the signal processing flow in combination with the hardware thereof.
Specifically, the processor 701 is configured to read a program in the memory 702 and execute: determining the random access time of the terminal according to the downlink channel transmitting power change rule and the grouping of the terminal; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time; and initiating random access according to the random access opportunity of the terminal.
Based on the same technical concept, the embodiment of the application also provides a computer storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to execute the processes performed by the base station side in the foregoing embodiments.
Based on the same technical concept, the embodiment of the application also provides a computer storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to execute the processes performed at the terminal side in the foregoing embodiments.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (29)

1. A downlink power control method, comprising:
the base station determines the transmitting power of the downlink channel according to the transmitting power change rule of the downlink channel; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time;
the base station sends the information carried by the downlink channel through the downlink channel according to the downlink channel transmitting power; and
when the cell is in the time unit with high transmission power, the base station preferentially schedules the edge terminal in the cell, and when the cell is in the time unit with low transmission power, the base station schedules only the non-edge terminal in the cell.
2. The method of claim 1, wherein according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies according to a period, wherein a period comprises a first time unit, a second time unit and a third time unit, and the downlink channel transmission power in at least 2 time units is different;
the physical cell identification PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
3. The method of claim 1, wherein the method further comprises:
and the base station informs the terminal of the downlink channel transmitting power change rule.
4. The method of claim 1, wherein the method further comprises:
the base station receives the downlink path loss reported by the terminal;
and the base station determines a group where the terminal is located according to the downlink path loss reported by the terminal and a path loss threshold value, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
5. The method of claim 1, wherein the method further comprises:
the base station sends the path loss threshold value to the terminal;
and the base station receives a group where the terminal is located, which is determined by the terminal according to the path loss threshold value and the downlink path loss measured by the terminal, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
6. The method of any of claims 1 to 5, wherein the downlink channel comprises: at least one of a narrowband Internet of things reference signal NRS channel, a downlink control channel and a downlink service channel.
7. A random access method, comprising:
the terminal determines the random access time of the terminal according to the downlink channel transmitting power change rule and the grouping of the terminal; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
and the terminal initiates random access according to the random access opportunity of the terminal.
8. The method of claim 7, wherein according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies according to a period, wherein a period comprises a first time unit, a second time unit and a third time unit, and the downlink channel transmission power in at least 2 time units is different;
the physical cell identification PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
9. The method of claim 7, wherein the determining, by the terminal, the random access timing of the terminal according to the downlink channel transmission power variation rule and the group in which the terminal is located comprises:
if the terminal determines that the cell where the terminal is located is in a time unit with high transmitting power according to the downlink channel transmitting power change rule and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or,
and if the terminal determines that the cell where the terminal is located is in a time unit with low transmitting power according to the downlink channel transmitting power change rule and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
10. The method of claim 7, wherein the method further comprises:
and the terminal receives the downlink channel transmitting power change rule sent by the base station.
11. The method of any of claims 7 to 10, further comprising:
the terminal reports the measured downlink path loss to the base station;
and the terminal receives the group where the terminal is located, which is determined by the base station according to the downlink path loss and the path loss threshold value.
12. The method of any of claims 7 to 10, further comprising:
the terminal receives a path loss threshold value sent by a base station;
and the terminal determines the grouping of the terminal according to the path loss threshold value and the downlink path loss measured by the terminal.
13. A base station, comprising:
the power determining module is used for determining the transmitting power of the downlink channel according to the transmitting power change rule of the downlink channel; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time;
a sending module, configured to send, according to the downlink channel transmission power, information carried by the downlink channel through the downlink channel;
the scheduling module is used for preferentially scheduling the edge terminal in the cell when the cell is in the time unit with high transmitting power; or, when the cell is in a time unit with low transmission power, only the non-edge terminal in the cell is scheduled.
14. A terminal, comprising:
a determining module, configured to determine a random access time of the terminal according to a downlink channel transmit power variation rule and a group in which the terminal is located; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
and the random access module is used for initiating random access according to the random access opportunity of the terminal.
15. The terminal of claim 14, wherein the determining module is specifically configured to:
if the cell where the terminal is located is determined to be in a time unit with high transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or,
and if the cell where the terminal is located is determined to be in a time unit with low transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
16. A base station, comprising: the system comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are connected through a bus;
the processor is used for reading the program in the memory and executing: determining the transmitting power of a downlink channel according to the transmitting power change rule of the downlink channel; the downlink channel transmitting power of one cell changes along with time, and the downlink channel transmitting power of one cell and at least one adjacent cell in the adjacent cells of the cell is not high at the same time; when the cell is in the time unit with high transmission power, preferentially scheduling the edge terminal in the cell, and when the cell is in the time unit with low transmission power, scheduling only the non-edge terminal in the cell;
and the transceiver is used for sending the information carried by the downlink channel through the downlink channel according to the downlink channel transmitting power.
17. The base station of claim 16, wherein according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies according to a period, and a period includes a first time unit, a second time unit and a third time unit, wherein the downlink channel transmission power in at least 2 time units is different;
the physical cell identification PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
18. The base station of claim 16, wherein the processor is further configured to:
and informing the terminal of the downlink channel transmitting power change rule through the transceiver.
19. The base station of claim 16, wherein the processor is further configured to:
receiving the downlink path loss reported by the terminal through the transceiver;
and determining a group where the terminal is located according to the downlink path loss reported by the terminal and a path loss threshold value, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
20. The base station of claim 16, wherein the processor is further configured to:
transmitting the path loss threshold value to a terminal through the transceiver;
and receiving a group where the terminal is located, which is determined by the terminal according to the path loss threshold value and the downlink path loss measured by the terminal, through the transceiver, wherein the group at least comprises an edge terminal user group and a non-edge terminal user group.
21. The base station according to any of claims 16 to 20, wherein the downlink channel comprises: at least one of a narrowband Internet of things reference signal NRS channel, a downlink control channel and a downlink service channel.
22. A terminal, comprising: the system comprises a processor, a memory and a transceiver, wherein the processor, the memory and the transceiver are connected through a bus; the processor is used for reading the program in the memory and executing:
determining the random access time of the terminal according to the downlink channel transmitting power change rule and the grouping of the terminal; the grouping at least comprises an edge terminal user group and a non-edge terminal user group, the downlink channel transmitting power of a cell changes along with time, and the downlink channel transmitting power of the cell and at least one adjacent cell in the adjacent cells of the cell are not high at the same time;
and initiating random access according to the random access opportunity of the terminal.
23. The terminal of claim 22, wherein according to the downlink channel transmission power variation rule, the downlink channel transmission power of a cell varies according to a period, and a period includes a first time unit, a second time unit and a third time unit, wherein the downlink channel transmission power in at least 2 time units is different;
the physical cell identification PCI and the cell with the module value of 3 equal to 0 are in high downlink channel transmitting power in a first time unit in a period; the PCI and the cell with the module value of 3 equal to 1 are in high downlink channel transmitting power in a second time unit in one period; and the PCI and the cell with the module value of 3 equal to 2 are in high downlink channel transmitting power in a third time unit in one period.
24. The terminal of claim 22, wherein the processor is specifically configured to:
if the cell where the terminal is located is determined to be in a time unit with high transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is an edge terminal user group, determining to initiate random access in the time unit; or,
and if the cell where the terminal is located is determined to be in a time unit with low transmitting power according to the downlink channel transmitting power change rule, and the group where the terminal is located is a non-edge terminal user group, determining to initiate random access in the time unit.
25. The terminal of claim 22, wherein the processor is further configured to:
and receiving the downlink channel transmitting power change rule sent by the base station through the transceiver.
26. The terminal of any of claims 22 to 25, wherein the processor is further configured to:
reporting the measured downlink path loss to a base station through the transceiver;
and receiving the grouping of the terminal determined by the base station according to the downlink path loss and the path loss threshold value through the transceiver.
27. The terminal of any of claims 22 to 25, wherein the processor is further configured to:
receiving a path loss threshold value sent by a base station through the transceiver;
and determining the grouping of the terminal according to the path loss threshold value and the downlink path loss measured by the terminal.
28. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1 to 6.
29. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 7 to 12.
CN201810015575.9A 2018-01-08 2018-01-08 A kind of downlink power control, accidental access method and device Pending CN110022599A (en)

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CN102378261A (en) * 2010-08-24 2012-03-14 普天信息技术研究院有限公司 Method and device for coordinating downlink interference of long term evolution system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1400805A (en) * 2001-07-31 2003-03-05 株式会社Ntt都科摩 Movable communication system, base station equipment and movable communication system controlling method
CN102378261A (en) * 2010-08-24 2012-03-14 普天信息技术研究院有限公司 Method and device for coordinating downlink interference of long term evolution system
CN102781083A (en) * 2011-05-10 2012-11-14 华为技术有限公司 Power distribution method, base station, user equipment and system
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