CN107040984B

CN107040984B - A kind of unauthorized frequency range ascending power control method and relevant device

Info

Publication number: CN107040984B
Application number: CN201610080088.1A
Authority: CN
Inventors: 王加庆; 潘学明; 司倩倩
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-02-04
Filing date: 2016-02-04
Publication date: 2019-07-26
Anticipated expiration: 2036-02-04
Also published as: WO2017133443A1; CN107040984A

Abstract

The invention discloses a kind of unauthorized frequency range ascending power control method and relevant devices, to provide the uplink power control scheme for being suitable for unauthorized frequency range LTE system.Method are as follows: base station obtains the interference strength information for interfering communication node of itself and/or terminal, peripheral；The base station determines the uplink transmission power of the terminal according to the interference strength information；The base station configures the terminal and carries out uplink signal transmission according to the uplink transmission power in unauthorized frequency range.

Description

Unlicensed frequency band uplink power control method and related equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an unlicensed frequency band uplink power control method and a related device.

Background

With the continuous increase of mobile data traffic, spectrum resources are more and more tense, and network deployment and service transmission performed by using authorized spectrum resources cannot meet traffic demands, so that an Unlicensed spectrum resource (U-LTE or LTE-U) is considered to be deployed and transmitted by a Long Term Evolution (LTE) system to improve user experience and extend coverage.

The unlicensed spectrum can be shared by multiple wireless communication systems, such as bluetooth, WiFi, and the like, and the unlicensed spectrum resources are used among the multiple systems by preempting the resources. Therefore, the coexistence between LTE-us deployed by different operators and between LTE-U and WiFi and other wireless communication systems is a major and difficult point of research. 3GPP requires to ensure fair coexistence of LTE-U, WiFi and other wireless communication systems, and an unauthorized frequency band is used as an auxiliary carrier and is realized by the assistance of a main carrier of an authorized frequency band. Listen Before Talk (LBT) is the basic means for LTE-U contention access.

A channel access mechanism adopted by the 802.11 system is called a carrier sense/collision avoidance (CSMA/CA) mechanism, and a resource preemption manner of WiFi on an unlicensed spectrum is shown in fig. 1, and the specific process is as follows: firstly, monitoring a channel, and determining that the current channel is an idle channel when the idle time of the channel reaches a DCF Inter-Frame Space (DIFS; DCF: distributed channel access); then, each station waiting for accessing the channel enters a random backoff stage for avoiding collision of multiple stations on the same resource. In order to ensure fairness, each station cannot occupy the unauthorized spectrum resources for a long time, and when the occupied duration reaches a certain time or the data transmission amount reaches an upper limit, the occupied unauthorized spectrum resources need to be released so that other systems can occupy the resources.

In order to provide an adaptive channel access mechanism with flexibility and fairness, europe requires the LBT technique to be adopted in the unlicensed 5150-. Clear Channel Assessment (CCA) determines whether a channel is currently occupied by using energy detection to determine whether the channel has a signal transmission. The ETSI standard classifies devices in an unlicensed frequency band into a home-based device and a load-based device, and corresponds to two types of access mechanisms: a Frame-Based device (FBE for short) and a Load-Based device (LBE for short), as shown in fig. 2a, a schematic diagram of an ETSI FBE channel access mechanism is shown, and as shown in fig. 2B, a schematic diagram of a channel access mechanism of an etsil be option B is shown.

The method comprises the steps that CCA detection is executed at a fixed position of a frame structure in an FBE access mechanism, the channel is accessed immediately as long as the channel is judged to be empty by a CCA period, a data transmission process is initiated, one CCA period is not less than 20us, the occupied time of channel transmission is relatively fixed, the minimum 1ms and the maximum 10ms are provided, the idle period is at least 5% of the occupied time of the channel, and new CCA detection is executed to access the channel again in the CCA time at the tail of the idle period. In the FBE mechanism, the channel occupation time plus idle period is a fixed value called frame period.

The LBE access mechanism is similar to the CSMA/CA mechanism of WiFi, and the time occupied and starting point of each transmission channel are variable, and extended CCA detection is performed before acquiring the channel. Firstly, a random factor N is generated according to the size q of a Contention Window (CW), and a channel is accessed to initiate a data transmission process until the idle time of the channel reaches N times of the CCA time and the channel is idle, and the maximum channel occupation time is 13 ms. ETSI LBE is divided into rotation a (option a) and option B (option B) options, wherein ETSI option B contention window is fixed and is the most basic LBE form.

The 3GPP currently defines four categories for LBT: LBT class 1 does not require LBT; LBT class 2, with a fixed backoff value, does not require random backoff before transmission initiation (burst), performs only one single CCA detection, i.e. access channel, FBE is a special case of LBT class 2; LBT type 3 and LBT type 4 both use CSMA/CA-like random back-off values, LBT type 3 uses fixed contention window, ETSI LBE option B belongs to LBT type 3; whereas LBT category 4 is based on ETSI LBEoption B modification, with load (load) based LBT, and the contention window is exponentially increasing or semi-statically configured. Due to the fact that the WiFi adopts a CSMA/CA access mechanism, a mode of expanding the competition window index is adopted. In order to achieve fair coexistence of LTE-U and WiFi, 3GPP requires that LBT class 4 should be employed at least in the downlink transmission of LTE-U. However, the uplink LBT scheme of LTE-U may adopt any one of 4 categories, and there is no current conclusion.

When the LTE-U and the WiFi coexist, the LTE-U adopts an energy detection method to identify the WiFi node, but the method has no capacity for mutual interference between the WiFi and the LTE-U caused by the following scenes. As shown in fig. 3, a base station (eNB) schedules UE1 for uplink transmission, and STA1, which is further away from UE1 on the other side of the base station, cannot detect the presence of UE1, so that the access channel transmits a signal to the AP, which causes the signal of STA1 to interfere with the uplink signal of UE1, and STA1 is a hidden node of UE 1.

On the other hand, currently, a terminal in LTE-U can perform uplink channel access only by being scheduled by a base station, resulting in that uplink channel access opportunities are much less than WiFi that does not need scheduling. Meanwhile, the LTE system adopts uplink power control, so that the transmitting power of the terminal can meet the requirement of good receiving of the base station, and interference to other cells is avoided. The uplink power control of the LTE consists of three parts, the first part is a basic open loop operating point, the second part is a dynamic offset, and the third part is a power offset related to a bandwidth. The basic open-loop operating point is a determining factor of uplink power control, and can be expressed as: p₀+ α XPL, where P₀Indicating the reference power when the terminal signal arrives at the base station, PL indicating the path loss, α indicating the path loss compensation factor, α taking 1 indicating the total path loss compensation, the power level of the terminal signal after arriving at the base station and the reference power P₀Similarly, the reference power value is only required to be greater than the receiving sensitivity of the base station, and the reference power value is configured for each terminal by a high layer through Radio Resource Control (RRC) signaling in a semi-static state. However, in the unlicensed band, there is no coordination between different systems, for example, WiFi considers that the channel is idle as long as the energy detection result is less than-62 dBm (decibel-milliwatt), and the threshold value is much higher than the reception sensitivity of LTE. If the transmission power of the terminal is smaller, the WiFi node near the UE is caused to access a channel and transmission collision occurs, and the uplink performance of the LTE-U is seriously influenced by the higher transmission power of the WiFi; if the terminal always adopts full power transmission, the terminal power consumption is overhigh, the power consumption is seriously wasted andaffecting battery life.

Therefore, the existing power control scheme of the licensed frequency band is not suitable for the unlicensed frequency band.

Disclosure of Invention

The embodiment of the invention provides an uplink power control method of an unlicensed frequency band and related equipment, which are used for providing an uplink power control scheme suitable for an LTE (Long term evolution) system of the unlicensed frequency band.

The embodiment of the invention provides the following specific technical scheme:

in a first aspect, an embodiment of the present invention provides a method for controlling uplink power in an unlicensed frequency band, including:

the method comprises the steps that a base station acquires interference strength information of interference communication nodes around the base station and/or a terminal;

the base station determines the uplink transmitting power of the terminal according to the interference strength information;

and the base station configures the terminal to transmit uplink signals in an unlicensed frequency band according to the uplink transmitting power.

In a possible implementation manner, the interfering communication node is a non-long term evolution LTE node or a long term evolution LTE-U node that deploys transmission on an unlicensed frequency band by another operator.

In a possible implementation, the uplink transmission power satisfies:

the power of an uplink signal sent by the terminal according to the uplink transmitting power and reaching the base station is larger than the power of any one interference communication node reaching the base station; and/or

And the power of the uplink signal sent by the terminal according to the uplink transmitting power and reaching the interference communication node and/or the base station is larger than a first preset threshold value.

In a possible embodiment, the configuring, by the base station, the terminal to perform uplink signal transmission in the unlicensed frequency band according to the uplink transmission power includes:

and the base station configures the reference power value of the uplink transmitting power of the terminal in the unauthorized frequency band through semi-static signaling or dynamic signaling.

In a possible implementation manner, the determining, by the base station, the uplink transmit power of the terminal according to the interference strength information includes:

the base station determines a power target value of the terminal according to the interference strength information, and determines uplink transmitting power of the terminal according to the power target value, wherein the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and the uplink transmitting power of the terminal is determined to meet the following requirements: and the power of the terminal when the uplink signal sent by the terminal according to the uplink transmitting power reaches the base station is not less than the power target value.

In a possible implementation manner, the determining, by the base station, the power target value of the terminal according to the interference strength information includes:

if the base station determines that strong interference communication nodes with interference intensity larger than a second preset threshold exist in the interference communication nodes around the base station according to the interference intensity information, the base station determines that the power target value of the terminal meets the following conditions:

the power target value is larger than the power of an interference signal of the strong interference communication node reaching the base station; or

The power of the uplink signal of the terminal when reaching the base station is not less than the power target value, and the power of the uplink signal of the terminal when reaching the strong interference communication node is greater than a first preset threshold value; or,

the power target value is the power of the uplink signal sent by the terminal with the maximum transmitting power reaching the base station.

if the base station determines that no strong interference communication node with interference intensity larger than a second preset threshold exists in the interference communication nodes around the base station according to the interference intensity information, and the strong interference communication node with interference intensity larger than the second preset threshold exists in the interference communication nodes around the terminal, determining that the power target value of the terminal meets the following conditions: the power target value is greater than a first preset threshold.

and if the base station determines that no communication node with the interference intensity larger than a second preset threshold exists in the peripheral interference communication nodes according to the interference intensity information, determining that the power target value of the terminal is not lower than a third preset threshold.

In a possible implementation manner, the power target value is obtained by adjusting a reference power value when an uplink signal of the terminal reaches the base station.

In a possible embodiment, the acquiring, by the base station, interference strength information of interfering communication nodes around the base station and/or the terminal includes:

the base station carries out channel measurement in the idle time period of the unlicensed frequency band channel and obtains the interference strength information of the interference communication nodes around the base station according to the measurement result; and/or the presence of a gas in the gas,

the base station monitors before conversation in an unauthorized frequency band channel, and obtains the interference strength information of interference communication nodes around the base station according to the monitoring result before conversation; and/or the presence of a gas in the gas,

the base station detects interference communication nodes of a non-LTE system around the base station to obtain interference intensity information of the interference communication nodes of the non-LTE system; and/or the presence of a gas in the gas,

the base station detects the types of interference communication nodes of non-LTE systems around the base station, and determines the interference strength information of the interference communication nodes; and/or the presence of a gas in the gas,

the base station detects LTE-U nodes which are deployed and transmitted on an unauthorized frequency band by other operators around the base station, and obtains interference intensity information of the LTE-U nodes of the other operators; and/or the presence of a gas in the gas,

the base station receives interference strength information of interference communication nodes around the terminal reported by the terminal, wherein the interference strength information reported by the terminal is obtained according to a measurement result after the terminal performs channel measurement on an unauthorized frequency band channel, or the interference strength information reported by the terminal is obtained by the terminal detecting interference communication nodes around the terminal, or the interference strength information reported by the terminal is determined after the terminal detecting the type of the interference communication nodes around the terminal.

In a possible implementation manner, the first preset threshold is not less than a threshold for the interfering communication node to detect whether a channel is idle.

In a second aspect, an embodiment of the present invention further provides an apparatus for controlling uplink power in an unlicensed frequency band, including:

the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring the interference intensity information of interference communication nodes around a base station and/or a terminal;

the processing module is used for determining the uplink transmitting power of the terminal according to the interference strength information acquired by the acquisition module;

and the configuration module is used for configuring the terminal to transmit uplink signals in an unauthorized frequency band according to the uplink transmitting power.

In a possible implementation, the uplink transmission power satisfies:

In a possible embodiment, the configuration module is specifically configured to:

and configuring the reference power value of the uplink transmitting power of the terminal in the unlicensed frequency band through semi-static signaling or dynamic signaling.

In a possible embodiment, the processing module is specifically configured to:

determining a power target value of the terminal according to the interference strength information, and determining uplink transmission power of the terminal according to the power target value, wherein the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and the uplink transmission power of the terminal is determined to meet the following requirements: and the power of the terminal when the uplink signal sent by the terminal according to the uplink transmitting power reaches the base station is not less than the power target value.

In a possible embodiment, the processing module is specifically configured to:

if it is determined according to the interference strength information that strong interference communication nodes with interference strength greater than a second preset threshold exist in the interference communication nodes around the base station, determining that a power target value of the terminal meets the following conditions:

In a possible embodiment, the processing module is specifically configured to:

if it is determined according to the interference strength information that there is no strong interference communication node with interference strength greater than a second preset threshold in the interference communication nodes around the base station and there is a strong interference communication node with interference strength greater than the second preset threshold in the interference communication nodes around the terminal, it is determined that the power target value of the terminal satisfies: the power target value is greater than a first preset threshold.

In a possible embodiment, the processing module is specifically configured to:

and if the communication nodes with the interference intensity larger than the second preset threshold do not exist in the peripheral interference communication nodes according to the interference intensity information, determining that the power target value of the terminal is not lower than a third preset threshold.

In a possible implementation manner, the obtaining module is specifically configured to:

performing channel measurement in an idle time period of an unlicensed frequency band channel, and obtaining interference strength information of interference communication nodes around the base station according to a measurement result; and/or the presence of a gas in the gas,

monitoring before conversation on an unauthorized frequency band channel, and acquiring interference strength information of interference communication nodes around the base station according to a monitoring result before conversation; and/or the presence of a gas in the gas,

detecting interference communication nodes of a non-LTE system around the base station, and obtaining interference intensity information of the interference communication nodes of the non-LTE system; and/or the presence of a gas in the gas,

detecting the type of an interference communication node of a non-LTE system around the base station, and determining the interference strength information of the interference communication node; and/or the presence of a gas in the gas,

detecting LTE-U nodes which are deployed and transmitted on an unauthorized frequency band by other operators around the base station, and acquiring interference intensity information of the LTE-U nodes of the other operators; and/or the presence of a gas in the gas,

receiving interference strength information of interference communication nodes around the terminal reported by the terminal, wherein the interference strength information reported by the terminal is obtained according to a measurement result after the terminal performs channel measurement on an unauthorized frequency band channel, or the interference strength information reported by the terminal is obtained by the terminal detecting the interference communication nodes around the terminal, or the interference strength information reported by the terminal is determined by the terminal detecting the types of the interference communication nodes around the terminal.

In a third aspect, an embodiment of the present invention further provides a base station, where the base station includes a processor, a memory, and a transceiver, where the transceiver is configured to receive and transmit data under control of the processor, the memory stores a preset program, and the processor is configured to read the program stored in the memory, and execute the following processes according to the program:

acquiring interference strength information of interference communication nodes around a base station and/or a terminal through a transceiver;

determining the uplink transmitting power of the terminal according to the acquired interference strength information;

and configuring the terminal to transmit uplink signals in an unlicensed frequency band according to the uplink transmitting power.

In a possible implementation, the uplink transmission power satisfies:

In a possible embodiment, the processor instructs the transceiver to configure the reference power value of the uplink transmit power of the terminal in the unlicensed frequency band through semi-static signaling or dynamic signaling.

In a possible implementation manner, the processor determines a power target value of the terminal according to the interference strength information, and determines uplink transmission power of the terminal according to the power target value, where the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and it is determined that the uplink transmission power of the terminal satisfies: and the power of the terminal when the uplink signal sent by the terminal according to the uplink transmitting power reaches the base station is not less than the power target value.

In a possible implementation manner, if it is determined, according to the interference strength information, that a strong interference communication node whose interference strength is greater than a second preset threshold exists among the interference communication nodes around the base station, the processor determines that a power target value of the terminal satisfies:

In a possible implementation manner, if it is determined, by the processor, according to the interference strength information that there is no strong interference communication node whose interference strength is greater than a second preset threshold in the interference communication nodes around the base station and there is a strong interference communication node whose interference strength is greater than the second preset threshold in the interference communication nodes around the terminal, it is determined that the power target value of the terminal satisfies: the power target value is greater than a first preset threshold.

In a possible implementation manner, if it is determined according to the interference strength information that there is no communication node with an interference strength greater than a second preset threshold among the peripheral interference communication nodes, the processor determines that the power target value of the terminal is not lower than a third preset threshold.

In a possible implementation manner, the processor performs channel measurement in an idle time period of an unlicensed frequency band channel through the transceiver, and obtains interference strength information of interference communication nodes around the base station according to a measurement result; and/or the presence of a gas in the gas,

the processor monitors before talking in an unauthorized frequency channel through the transceiver and obtains the interference strength information of interference communication nodes around the base station according to the monitoring result before talking; and/or the presence of a gas in the gas,

the processor detects interference communication nodes of a non-LTE system around the base station through the transceiver, and obtains interference strength information of the interference communication nodes of the non-LTE system; and/or the presence of a gas in the gas,

the processor detects the type of an interference communication node of a non-LTE system around the base station through the transceiver and determines the interference strength information of the interference communication node; and/or the presence of a gas in the gas,

the processor detects long term evolution LTE-U nodes which are deployed and transmitted on an unauthorized frequency band by other operators around the base station through the transceiver, and obtains interference intensity information of the LTE-U nodes of the other operators; and/or the presence of a gas in the gas,

the processor receives interference strength information of interference communication nodes around the terminal reported by the terminal through the transceiver, wherein the interference strength information reported by the terminal is obtained according to a measurement result after the terminal performs channel measurement on an unauthorized frequency band channel, or the interference strength information reported by the terminal is obtained by the terminal detecting interference communication nodes around the terminal, or the interference strength information reported by the terminal is determined after the terminal detecting the type of the interference communication nodes around the terminal.

Based on the technical scheme, in the embodiment of the invention, in the unlicensed frequency band, the base station determines the uplink transmitting power of the terminal according to the interference strength information of the interference communication node at the periphery of the base station and/or the terminal, so that the problem that the terminal and the interference communication node collide due to the fact that the base station cannot detect the access channel of the terminal when the power of the interference communication node is large can be avoided, meanwhile, the problem that the battery life is influenced due to overlarge power consumption due to the fact that the uplink transmitting power of the terminal is increased unlimitedly can be avoided, and a solution is provided for controlling the uplink power of the unlicensed frequency band LTE system.

Drawings

Fig. 1 is a schematic diagram illustrating a process of preempting resources by WiFi on an unlicensed spectrum;

FIG. 2a is a diagram of an ETSI FBE channel access mechanism;

FIG. 2B is a diagram illustrating the channel access mechanism of ETSI LBE option B;

FIG. 3 is a schematic diagram of a hidden node;

fig. 4 is a schematic flow chart of a method for controlling uplink power of a terminal in an unlicensed frequency band by a base station in an embodiment of the present invention;

fig. 5 is a schematic view of a scenario of a communication node with strong interference around a base station according to an embodiment of the present invention;

fig. 6 is a schematic view of a scenario of a communication node with strong interference around a terminal in an embodiment of the present invention;

fig. 7 is a scene schematic diagram of a communication node where there is no strong interference around the base station and the terminal in the embodiment of the present invention;

fig. 8 is a schematic structural diagram of an unlicensed band uplink power control apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a base station in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the embodiment of the present invention, as shown in fig. 4, in an LTE system, a detailed method flow for a base station to control uplink power of a terminal in an unlicensed frequency band is as follows:

step 401: the base station acquires the interference strength information of the interference communication nodes around the base station and/or the terminal.

In implementation, the base station acquires interference strength information of non-LTE nodes around the base station or LTE-U nodes of other operators. And/or the base station acquires the interference strength information of non-LTE nodes around the terminal or LTE-U nodes of other operators.

Specifically, the base station acquires interference strength information of interfering communication nodes around itself and/or the terminal, including but not limited to the following implementation manners:

firstly, a base station carries out channel measurement in an idle time period of an unlicensed frequency band channel, and obtains interference strength information of interference communication nodes around the base station according to a measurement result;

secondly, the base station monitors before talking in an unauthorized frequency channel, and obtains the interference strength information of the interference communication nodes around the base station according to the monitoring result before talking;

thirdly, the base station detects interference communication nodes of the non-LTE system around the base station to obtain interference intensity information of the interference communication nodes of the non-LTE system around the base station;

fourthly, the base station detects the types of interference communication nodes of the non-LTE system around the base station and determines the interference intensity information of the interference communication nodes;

for example, a base station determines whether a WiFi station exists around the base station by detecting a Beacon (Beacon) frame of the WiFi station, where the Beacon frame is a broadcast frame sent by the WiFi station, and the Beacon frame carries configuration information of the WiFi station. The base station can also decode the preamble signal sent by the WiFi station to identify whether the WiFi station exists in the periphery of the base station.

Fifthly, the base station detects LTE-U nodes of other operators around the base station to obtain interference intensity information of the LTE-U nodes of the other operators;

for example, the base station detects the operator identifier carried in the received signal to identify whether LTE-U sites of other operators exist around the base station.

Sixthly, the base station receives the interference intensity information of the communication nodes around the terminal reported by the terminal, and the interference intensity information of the communication nodes around the terminal is obtained according to the measurement result after the terminal performs channel measurement on the unauthorized frequency band channel; or the interference intensity information of the communication nodes around the terminal is obtained by the communication nodes of the non-LTE system around the terminal detection itself; or the interference strength information reported by the terminal is determined after the terminal detects the type of the interference communication node of the non-LTE system around the terminal.

For example, a terminal determines whether a WiFi station exists around the terminal by detecting a Beacon (Beacon) frame of the WiFi station, where the Beacon frame is a broadcast frame sent by the WiFi station, and the Beacon frame carries configuration information of the WiFi station.

For example, the terminal detects the operator identifier carried in the received signal to identify whether LTE-U sites of other operators exist around the terminal.

Step 402: and the base station determines the uplink transmitting power of the terminal according to the interference strength information of the base station and/or the interference communication nodes around the terminal.

In implementation, the uplink transmission power of the terminal determined by the base station satisfies any one of the following three conditions, or simultaneously satisfies the following three conditions:

under the first condition, the power of the uplink signal, which is sent by the terminal according to the uplink transmission power, reaching the base station is greater than the power of any one interfering communication node at the base station and/or the periphery of the terminal reaching the base station in step 401.

And under the second condition, the power of an uplink signal sent by the terminal according to the uplink transmitting power and reaching any one interference communication node around the base station and/or the terminal in the step 401 is greater than the first preset threshold.

In one embodiment, the first preset threshold is not less than a threshold for the interfering communication node to detect whether the channel is idle.

And thirdly, the power of the uplink signal, which is sent by the terminal according to the uplink transmitting power, reaching the base station is greater than the first preset threshold value.

Specifically, the first preset threshold is not less than a threshold for the interfering communication node to detect whether the channel is idle.

In a specific embodiment, a base station determines a power target value of a terminal according to interference strength information of interference communication nodes around the base station and/or the terminal, and determines uplink transmission power of the terminal according to the power target value, where the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and it is determined that the uplink transmission power of the terminal satisfies: and the power of the terminal when the uplink signal sent by the terminal according to the uplink transmitting power reaches the base station is not less than the power target value.

Specifically, the base station determines the power target value of the terminal in different ways according to different application scenarios, which is as follows:

firstly, a base station determines that a strong interference communication node with interference intensity greater than a second preset threshold exists in interference communication nodes around the base station, and in the scene, no matter whether the strong interference communication node with interference intensity greater than the second preset threshold exists around a terminal, the base station determines that a power target value of the terminal meets one of the following conditions:

the power target value is larger than the power of an interference signal of a strong interference communication node reaching the base station;

the power of the uplink signal of the terminal when reaching the base station is not less than the power target value, and the power of the uplink signal of the terminal when reaching the strong interference communication node is greater than a first preset threshold value;

In one specific implementation, the first preset threshold is not less than a threshold for the interfering communication node to detect whether the channel is idle.

Specifically, the base station increases the uplink transmission power of the terminal under the condition that the strong interference communication node exists around the base station, so that the power of an uplink signal of the terminal reaching the base station, namely the power target value exceeds the power of the strong interference communication node reaching the base station; or, the power of the uplink signal of the terminal reaching the strong interference communication node exceeds a first preset threshold, for example, exceeds-62 dBm, where-62 dBm is a threshold for detecting whether a channel is idle by the WiFi station; or, in the case that the uplink transmission power of the terminal is limited and cannot satisfy the above two conditions, that is, when the base station determines that the uplink transmission power of the terminal has been increased to the maximum value, the base station directly determines the power target value according to the maximum uplink transmission power of the terminal.

Secondly, if the base station determines that no strong interference communication node with interference intensity greater than a second preset threshold exists in the interference communication nodes around the base station, and determines that a strong interference communication node with interference intensity greater than the second preset threshold exists in the interference communication nodes around the terminal, the base station determines that the power target value of the terminal meets the following requirements: the power target value is greater than a first preset threshold.

Specifically, when the base station determines that there is no strong interference communication node around itself and determines that there is a strong interference communication node around the terminal, the uplink transmission power of the terminal is increased, so that the power of the uplink signal of the terminal reaching the base station is greater than a first preset threshold, for example, the power of the uplink signal of the terminal reaching the base station is greater than-62 dBm, where-62 dBm is a threshold for detecting whether a channel is idle at the WiFi station.

Thirdly, if the base station determines that no communication node with the interference intensity larger than the second preset threshold exists in the base station and the interference communication nodes around the terminal, the base station determines that the power target value of the terminal is not lower than the third preset threshold.

Specifically, the third preset threshold is smaller than the first preset threshold.

Specifically, when the base station determines that no strong interference communication node exists between itself and the periphery of the terminal, the base station determines that the uplink transmission power of the terminal only needs to be capable of overcoming weak interference between cells, that is, the terminal can adopt smaller uplink transmission power, and the third preset threshold depends on the receiving sensitivity of the base station and the weak interference between cells. The situation can be compatible with the uplink power control of the LTE system in the authorized frequency band.

Specifically, the power target value is obtained mainly by adjusting a reference power value when an uplink signal of the terminal reaches the base station. In a specific implementation, the power target values are expressed as follows:

P_PUSCH(i)＝min{P_CMAX,10log₁₀(M_PUSCH(i))+

P_{O_PUSCH}(j)+α(j)·PL+Δ_TF(i)+f(i)}

where i denotes a subframe index, 10log₁₀(M_PUSCH(i) Represents a bandwidth-dependent power offset, which in the case of a bandwidth determination is a fixed value, P_{O_PUSCH}(j) Indicating a reference power value, α (j) · PL indicating a path loss, wherein α (j) is less than or equal to 1, indicating a compensation factor, and Δ if α (j) is equal to 1, indicating a complete compensation_TF(i) + f (i) denotes a dynamic offset value.

It can be seen from the expression that the bandwidth-related power offset is a fixed value, the path loss is determined by measurement, and the dynamic offset value is small, so that the power target value is greatly affected to be a reference power value, the purpose of adjusting the power target value can be achieved by adjusting the reference power value, and the sum of the reference power value and the bandwidth-related power offset value is approximately equal to the power target value.

Step 403: and the base station configures the terminal to transmit uplink signals in the unlicensed frequency band according to the uplink transmission power determined in the step 402.

In the implementation, the base station determines the uplink transmission power of the terminal, mainly for determining the reference power value of the terminal, and after determining the reference power value of the terminal, the base station configures the reference power value of the uplink transmission power of the terminal in the unlicensed frequency band through a semi-static signaling or a dynamic signaling. The semi-static signaling is high-pass signaling, and the dynamic signaling may be Physical Uplink Control Channel (PUCCH) signaling.

In an implementation, the first preset threshold, the second preset threshold, and the third preset threshold may be preset empirical values, or threshold values agreed by a protocol.

The following illustrates the process of uplink power control of a terminal by a base station in an unlicensed frequency band by using three specific embodiments.

First embodiment

Step a, a base station acquires interference intensity information of communication nodes of a non-LTE system and/or other operators around the base station or the terminal.

First, the base station measures communication nodes of non-LTE systems and/or other operators around the base station itself to obtain interference strength information.

The specific measurement and detection methods used include, but are not limited to, the following two methods:

first, the base station may perform channel measurement and detection in a time period in which no uplink or downlink transmission is scheduled in the unlicensed frequency band. And the base station judges the interference intensity of non-LTE communication nodes around the base station or LTE-U communication nodes of other operators according to the measurement result of the unauthorized frequency band.

For example, the base station determines whether a strong interference source exists around the base station according to the measured received Signal Strength indication rssi (received Signal Strength indicator) of the LTE-U communication node of the non-LTE or other operators.

Second, the base station may perform Listen Before Talk (LBT) operation in the unlicensed band, and determine the strength of the channel interference according to the result of the energy detection performed by the LBT.

Third, the base station may detect the presence of a WiFi communication node.

For example, the base station detects a Beacon (Beacon) frame of WiFi or detects a WiFi signal, so that it can be confirmed whether there is WiFi in the periphery of the base station.

Secondly, the terminal can measure and detect the communication nodes of the non-LTE system and/or other operators around the terminal in a manner similar to that of the base station, and report the interference strength information of the interference communication nodes around the terminal obtained by measurement to the base station.

The base station judges whether a strong interference source which has a large influence on the receiving performance exists around the base station and the terminal according to the interference strength information of the interference communication nodes around the base station and the interference strength information of the interference communication nodes around the terminal reported by the terminal, for example, the base station determines whether a WiFi station exists around the base station or the terminal according to the measurement and detection results of the base station and the detection results of the terminal.

And b, the base station determines that the LTE-U communication nodes of the non-LTE or other operators influencing the receiving performance of the base station exist around the base station according to the interference intensity information of the non-LTE system around the base station or the terminal and/or the communication nodes of other operators, and determines the uplink transmitting power of the terminal according to the interference intensity information of the LTE-U communication nodes of the non-LTE or other operators.

Specifically, as shown in fig. 5, STA1 is a hidden node of UE1, and will have a serious impact on the reception quality of the uplink signal of UE 1. The base station may determine, according to the magnitude of the interference strength caused by the STA1, an appropriate power target value for the terminal, where the power target value represents power of an uplink signal of the terminal after reaching the base station.

In a specific implementation, the base station only needs to set the power target value of the uplink signal of the terminal reaching the base station to be much higher than the power of the signal of the interfering node reaching the base station, so that the interference source similar to the hidden node does not have an obvious influence on the uplink signal of the terminal.

In another specific implementation, the base station sets the uplink signal of the terminal to reach the power target value of the base station, so that the power values of the uplink signals of the terminal within a range that has a large influence on the receiving performance of the base station are all greater than a set threshold value, for example, the threshold value is-62 dBm, which is only an example, and does not exclude that the threshold value is set to other values, so that when the scheduled terminal performs uplink transmission, an interference node near the base station cannot access a channel, and occurrence of transmission collision is avoided.

The method provided by the embodiment can reduce the interference of the hidden node, and can prevent the channel transmitted by the terminal from being accessed by other systems.

Specifically, the base station sets various parameters of power control according to the determined power target value, so as to determine the uplink transmission power of the terminal. And the base station configures uplink transmitting power for the terminal through semi-static or dynamic signaling.

Particularly, the base station may configure the reference power semi-statically according to the original LTE protocol, and may also configure the value of the reference power through dynamic signaling.

Second embodiment

Step a is the same as the description of step a in the first embodiment, and is not repeated here.

And b, the base station determines that the LTE-U communication nodes of the non-LTE or other operators influencing the receiving performance do not exist around the base station according to the interference intensity information of the non-LTE system and/or the communication nodes of other operators around the base station or the terminal, determines that the LTE-U communication nodes of the non-LTE or other operators influencing the receiving performance exist around the base station, and determines the uplink transmitting power of the terminal according to the interference intensity information of the LTE-U communication nodes of the non-LTE or other operators.

Specifically, the base station may determine an appropriate power target value for the terminal according to the interference strength information of the interfering communication nodes around the terminal, where the power target value represents the power of the uplink signal of the terminal after reaching the base station. In a simple implementation, the power target value is a reference power value, which is only an example, and the power target value is not limited to the reference power value in the implementation.

Specifically, the base station may set the power target value to be greater than a preset threshold value, for example, the preset threshold value is near-62 dBm, which is only an example, and in practical application, the preset threshold value is excluded from being set to other values, so that when the scheduled terminal performs uplink signal transmission, interfering communication nodes around the terminal cannot access a channel, and the interfering communication nodes that can access the channel when the terminal transmits cannot cause severe interference to the base station.

As shown in fig. 6, when UE1 is transmitting, STA1 is far away from eNB, and STA1 can access the channel without significant impact on the reception quality of eNB; while STA2 detects that the channel is busy even though it is closer to UE1, UE1 does not collide with STA2 for transmission.

The method provided by the specific embodiment can effectively ensure the uplink transmission performance, does not need to adopt overhigh power transmission by the terminal, and is favorable for saving electricity of the terminal.

Third embodiment

And b, the base station determines that the LTE-U communication nodes of the non-LTE system or other operators influencing the receiving performance do not exist around the base station according to the interference intensity information of the non-LTE system and/or the communication nodes of other operators around the base station or the terminal, determines that the LTE-U communication nodes of the non-LTE system or other operators influencing the receiving performance do not exist around the terminal, and determines that the uplink transmitting power of the terminal is greater than a third preset threshold.

Specifically, as shown in fig. 7, the base station sets the power target value of the terminal to a smaller value, for example, if the receiving performance allows, the difference between the power target value and the receiving sensitivity is set as much as possible within a set range, so that the advantage of the uplink power control of the LTE system in the licensed band can be inherited.

Based on the same inventive concept, an unlicensed band uplink power control apparatus is further provided in the embodiments of the present invention, and for specific implementation of the apparatus, reference may be made to the description of the foregoing method embodiment, and repeated details are not described again, as shown in fig. 8, the apparatus mainly includes:

an obtaining module 801, configured to obtain interference strength information of interference communication nodes around a base station and/or a terminal;

a processing module 802, configured to determine uplink transmit power of the terminal according to the interference strength information obtained by the obtaining module;

a configuring module 803, configured to configure the terminal to perform uplink signal transmission in the unlicensed frequency band according to the uplink transmission power.

In a possible implementation, the uplink transmission power satisfies:

In a possible embodiment, the processing module is specifically configured to:

Specifically, the apparatus is provided in a base station.

Based on the same inventive concept, an embodiment of the present invention further provides a base station, and specific implementation of the base station may refer to the description of the foregoing method embodiment, and repeated parts are not repeated, as shown in fig. 9, the base station mainly includes a processor 901, a memory 902, and a transceiver 903, where the transceiver 903 is configured to receive and transmit data under the control of the processor 901, a preset program is stored in the memory 902, and the processor 901 is configured to read the program stored in the memory 902, and execute the following processes according to the program:

acquiring interference strength information of interference communication nodes around a base station and/or a terminal through a transceiver 903;

In a possible implementation, the uplink transmission power satisfies:

In a possible embodiment, the processor 901 instructs the transceiver 903 to configure the reference power value of the uplink transmission power of the terminal in the unlicensed frequency band through semi-static signaling or dynamic signaling.

In a possible implementation manner, the processor 901 determines a power target value of the terminal according to the interference strength information, and determines an uplink transmission power of the terminal according to the power target value, where the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and it is determined that the uplink transmission power of the terminal satisfies: and the power of the terminal when the uplink signal sent by the terminal according to the uplink transmitting power reaches the base station is not less than the power target value.

In a possible implementation manner, if it is determined, according to the interference strength information, that a strong interference communication node whose interference strength is greater than a second preset threshold exists in the interference communication nodes around the base station, the processor 901 determines that a power target value of the terminal satisfies:

In a possible embodiment, if it is determined according to the interference strength information that there is no strong interference communication node whose interference strength is greater than a second preset threshold in the interference communication nodes around the base station and there is a strong interference communication node whose interference strength is greater than the second preset threshold in the interference communication nodes around the terminal, the processor 901 determines that the power target value of the terminal satisfies: the power target value is greater than a first preset threshold.

In a possible embodiment, if it is determined according to the interference strength information that there is no communication node with an interference strength greater than a second preset threshold in the peripheral interference communication nodes, the processor 901 determines that the power target value of the terminal is not lower than a third preset threshold.

In a possible embodiment, the processor 901 performs channel measurement in an idle time period of an unlicensed frequency band channel through the transceiver 903, and obtains interference strength information of an interfering communication node around the base station according to a measurement result; and/or the presence of a gas in the gas,

the processor 901 monitors before talking in an unlicensed frequency band channel through the transceiver 903, and obtains interference strength information of interference communication nodes around the base station according to the result of the monitoring before talking; and/or the presence of a gas in the gas,

the processor 901 detects an interference communication node of a non-LTE system around the base station through the transceiver 903, and obtains interference strength information of the interference communication node of the non-LTE system; and/or the presence of a gas in the gas,

the processor 901 detects the type of an interference communication node of a non-LTE system around the base station through the transceiver 903, and determines interference strength information of the interference communication node; and/or the presence of a gas in the gas,

the processor 901 detects, through the transceiver 903, long term evolution LTE-U nodes where other operators around the base station deploy transmission in an unlicensed frequency band, and obtains interference strength information of the LTE-U nodes of the other operators; and/or the presence of a gas in the gas,

the processor 901 receives, through the transceiver 903, interference strength information of the interfering communication nodes around the terminal reported by the terminal, where the interference strength information reported by the terminal is obtained according to a measurement result after the terminal performs channel measurement on an unlicensed frequency band channel, or the interference strength information reported by the terminal is obtained by the terminal detecting interfering communication nodes around the terminal in a non-LTE system, or the interference strength information reported by the terminal is determined by the terminal detecting types of the interfering communication nodes around the terminal in the non-LTE system.

Where the processors, memory and transceivers are connected by a bus, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by the processors and various circuits of the memory represented by the memory 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 transceiver may be a plurality of elements, i.e., including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus architecture and the usual processing, and the memory may store data used by the processor in performing operations.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An uplink power control method for an unlicensed frequency band, comprising:

the base station determines a power target value of the terminal according to the interference strength information, and determines uplink transmitting power of the terminal according to the power target value; wherein, the power target value represents a minimum power value when the uplink signal of the terminal reaches the base station, and the uplink transmission power of the terminal is determined to meet the following conditions: the power of the terminal when the uplink signal sent by the uplink transmitting power reaches the base station is not less than the power target value;

the base station configures the terminal to transmit uplink signals in an unlicensed frequency band according to the uplink transmitting power;

wherein, the base station determines the power target value of the terminal according to the interference strength information, and the method includes:

the power target value is the power of an uplink signal sent by the terminal with the maximum transmitting power reaching the base station;

if the base station determines that no strong interference communication node with interference intensity larger than a second preset threshold exists in the interference communication nodes around the base station according to the interference intensity information, and the strong interference communication node with interference intensity larger than the second preset threshold exists in the interference communication nodes around the terminal, determining that the power target value of the terminal meets the following conditions: the power target value is greater than a first preset threshold value;

2. The method of claim 1, in which the interfering communication node is a non-Long Term Evolution (LTE) node or a LTE-U node that deploys transmissions on unlicensed frequency bands by other operators.

3. The method of claim 1, wherein the uplink transmit power satisfies:

4. The method of claim 1, wherein the base station configuring the terminal to perform uplink signal transmission in an unlicensed frequency band according to the uplink transmission power comprises:

5. The method of claim 1, wherein the power target value is obtained by adjusting a reference power value of an uplink signal of the terminal when the uplink signal reaches the base station.

6. The method according to any one of claims 1 to 4, wherein the base station acquires the interference strength information of the interfering communication nodes around itself and/or the terminal, and comprises:

7. The method according to claim 1 or 3, wherein the first preset threshold is not less than a threshold for the interfering communication node to detect whether a channel is idle.

8. An apparatus for controlling uplink power in an unlicensed frequency band, comprising:

a processing module, configured to determine a power target value of the terminal according to the interference strength information, and determine uplink transmit power of the terminal according to the power target value, where the power target value represents a minimum power value when an uplink signal of the terminal reaches the base station, and it is determined that the uplink transmit power of the terminal satisfies: the power of the terminal when the uplink signal sent by the uplink transmitting power reaches the base station is not less than the power target value;

a configuration module, configured to configure the terminal to perform uplink signal transmission in an unlicensed frequency band according to the uplink transmission power;

the processing module is specifically configured to determine that a power target value of the terminal meets the following requirements if it is determined according to the interference strength information that a strong interference communication node with interference strength greater than a second preset threshold exists in the interference communication nodes around the base station:

if it is determined according to the interference strength information that there is no strong interference communication node with interference strength greater than a second preset threshold in the interference communication nodes around the base station and there is a strong interference communication node with interference strength greater than the second preset threshold in the interference communication nodes around the terminal, it is determined that the power target value of the terminal satisfies: the power target value is greater than a first preset threshold value;

9. The apparatus of claim 8, in which the interfering communication node is a non-Long Term Evolution (LTE) node or a LTE-U node that deploys transmissions on unlicensed frequency bands by other operators.

10. The apparatus of claim 8, wherein the uplink transmit power satisfies:

11. The apparatus of claim 8, wherein the configuration module is specifically configured to:

12. The apparatus of claim 8, wherein the processing module is specifically configured to:

13. The apparatus of claim 8, wherein the power target value is obtained by adjusting a reference power value of an uplink signal of the terminal when the uplink signal reaches the base station.

14. The apparatus of any one of claims 8-11, wherein the acquisition module is specifically configured to: