IRS self-adaptive reflection method and system based on limited rate

Abstract

The invention relates to the technical field of wireless communication, and discloses an IRS self-adaptive reflection method and system based on a limited rate, and the method comprises the steps: setting the total number N of IRS reflection units and the number Na and Np of initial reflection units in an active mode and a passive mode, and setting a transmission rate threshold value Vth at the same time; calculating a reachable rate V according to the current system parameters; comparing the reachable rate V with a transmission rate threshold value Vth, and dynamically adjusting the number Na and Np of the reflection units in the active mode and the passive mode according to a comparison result; when Na or Np reaches a preset condition, executing special processing, and recalculating a reachable rate V; and repeating the steps until the transmission rate requirement is met. According to the method, the set target threshold rate Vth is compared with the reachable rate V, the number of the active IRS and the number of the passive IRS can be dynamically adjusted according to the comparison result IRS, the requirement of the system for the transmission rate can be met, the energy consumption of the system can be saved, and the performance balance of the energy efficiency and the spectrum efficiency of the system is achieved.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to an IRS adaptive reflection method and system based on a limited rate. Background Art

[0002] As a wireless signal reflection device, the intelligent reflecting surface (IRS) has the advantages of realizing intelligent control over the wireless communication environment and improving the transmission rate.

[0003] Currently, there are two types of intelligent reflection surfaces: active IRS and passive IRS. Passive IRS reflection has the advantages of not consuming energy and not amplifying noise, but it will cause multiplicative fading of the signal and require the deployment of a large number of reflection units. Active IRS reflection has the advantages of high gain and a small number of reflection units to be deployed, but it will consume additional energy and amplify interference noise.

[0004] The hybrid IRS utilizes the advantages of both IRSs, but the number of its active IRS and passive IRS is fixed and cannot be adaptively adjusted with the external environment. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes an IRS adaptive reflection method and system based on a limited rate to solve the above technical problems.

[0006] In a first aspect, a method for adaptive reflection of an IRS based on a limited rate is provided, comprising:

[0007] S01, setting the total number N of IRS reflection units, as well as the initial number Na and Np of reflection units in active mode and passive mode, and setting the transmission rate threshold Vth;

[0008] S02, calculating the achievable rate V according to the current system parameters;

[0009] S03, comparing the achievable rate V with the transmission rate threshold Vth, and dynamically adjusting the number of reflection units Na and Np in the active mode and the passive mode according to the comparison result;

[0010] S04. When Na or Np reaches a preset condition, special processing is performed and the achievable rate V is recalculated;

[0011] S05. Repeat steps S02 to S04 until the transmission rate requirement is met.

[0012] Furthermore, in step S01, the initial numbers of reflection units Na and Np in the active mode and the passive mode are both set to N / 2.

[0013] Further, in step S02, the achievable rate V is calculated taking into account the base station's transmit power, power amplification factor, channel gain factor, number of active reflection units, number of passive reflection units, distance between the base station and the IRS, distance between the IRS and the user, power of additive noise, and power of amplified noise.

[0014] Further, in step S03,

[0015] When the achievable rate V is greater than the transmission rate threshold Vth, the number of active reflection units Na is halved;

[0016] When the achievable rate V is less than the transmission rate threshold Vth, the number of passive reflection units Np is halved.

[0017] Further, in step S04, when the number of active reflection units Na or the number of passive reflection units Np is equal to 1, a special process is performed to set Na or Np to 0 and set the number of reflection units of another mode to N.

[0018] Furthermore, the method further includes step S06, after reaching a configuration that meets the transmission rate requirement, keeping the current numbers of reflection units Na and Np in the active mode and the passive mode unchanged until the system parameters change.

[0019] In a second aspect, an IRS adaptive reflection system based on a limited rate is provided, including:

[0020] An IRS reflection unit array, used to adjust the phase and amplitude of the reflection signal according to the control signal;

[0021] A control unit, used to set the total number N of IRS reflection units, and the initial number Na and Np of reflection units in the active mode and the passive mode, and set the transmission rate threshold Vth, and calculate the achievable rate V according to the current system parameters, compare the achievable rate V with the transmission rate threshold Vth, and dynamically adjust the number Na and Np of reflection units in the active mode and the passive mode;

[0022] The communication interface is used to receive information about changes in system parameters and transmit it to the control unit.

[0023] In a third aspect, an IRS adaptive reflection system based on a limited rate is provided, comprising a processor and a memory storing program instructions, wherein the processor is used to execute an IRS adaptive reflection method based on a limited rate as described in any one of the foregoing items when running the program instructions.

[0024] The invention adopting the above technical solution has the following advantages:

[0025] The present invention proposes an adaptive IRS with dual modes, whose reflection working mode can be switched between active reflection and passive reflection. According to the set target threshold rate Vth, the achievable rate V is compared, and according to the comparison result, the IRS can dynamically adjust the number of active IRS and passive IRS, which can not only meet the system's requirements for transmission rate, but also save the system's energy consumption, and achieve a performance balance between the system's energy efficiency and spectrum efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0027] Figure 1 The present invention is an IRS adaptive reflection method based on limited rate and a system algorithm flow chart;

[0028] Figure 2 The present invention is a flow chart of an IRS adaptive reflection method based on a limited rate. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0030] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the present invention belongs. The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to implement the embodiments of the present disclosure described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. Unless otherwise specified, the term "multiple" means two or more. In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship of objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B. The term "corresponding" can refer to an association relationship or a binding relationship, and A and B correspondingly refer to an association relationship or a binding relationship between A and B.

[0031] like Figure 1-2 As shown, an IRS adaptive reflection method based on a limited rate of the present invention comprises:

[0032] Step S01, setting the total number N of IRS reflection units, as well as the initial number Na and Np of reflection units in active mode and passive mode, and setting the transmission rate threshold Vth;

[0033] Step S02, calculating the achievable rate V according to the current system parameters;

[0034] Step S03, comparing the achievable rate V with the transmission rate threshold Vth, and dynamically adjusting the number of reflection units Na and Np in the active mode and the passive mode according to the comparison result;

[0035] Step S04: When Na or Np reaches a preset condition, special processing is performed and the achievable rate V is recalculated;

[0036] Step S05: Repeat steps S02 to S04 until the transmission rate requirement is met.

[0037] Specifically, the present invention is an IRS adaptive reflection mechanism based on a limited rate. The adaptive IRS reflection unit has two working modes: active reflection and passive reflection. Under the set transmission rate threshold value, the system dynamically adjusts the number of reflection units Na and Np in the two working modes according to the comparison result between the achievable rate and the threshold rate. When the transmission achievable rate V is greater than the threshold rate Vth, the number of active IRSs is cyclically halved; when the transmission achievable rate V is less than the threshold rate Vth, the number of passive IRSs is cyclically halved until the communication system meets the transmission rate requirements. Under the premise of meeting the transmission rate, the adaptive reflection mechanism reduces the newly added noise power, reduces the total energy consumption of the system, and improves the energy efficiency of the system.

[0038] The present invention proposes an adaptive IRS with dual modes, whose reflection working mode can be switched between active reflection and passive reflection. According to the set target threshold rate Vth, the achievable rate V is compared, and according to the comparison result, the IRS can dynamically adjust the number of active IRS and passive IRS, which can not only meet the system's requirements for transmission rate, but also save the system's energy consumption, and achieve a performance balance between the system's energy efficiency and spectrum efficiency.

[0039] In some embodiments, in step S01 , the initial numbers of reflection units Na and Np in the active mode and the passive mode are both set to N / 2.

[0040] Specifically, (1) the number of adaptive IRS reflection units is set to N, the number of IRS reflection units in active mode is Na=N / 2, and the number of IRS reflection units in passive mode is Np=N / 2. At the same time, according to the actual scenario requirements, the threshold rate is set to Vth (for example, in the Internet of Vehicles, when the QoS of the cellular user is set to SINRmin=5dB, the corresponding cellular user CUE rate threshold is Vth=16.6bit / s).

[0041] In some embodiments, (2) the system achievable rate is calculated

[0042]

[0043] Among them, P T represents the transmission power of the base station, η represents the power amplification factor, β represents the channel gain factor, N a Indicates the number of active reflection units, N p represents the number of passive reflection units, d TI represents the distance between the base station and the IRS, d IR represents the distance between IRS and the user, represents the power of additive noise, Represents the power of the amplified noise.

[0044] In some embodiments, in step S02, the achievable rate V is calculated taking into account the base station's transmit power, power amplification factor, channel gain factor, number of active reflection units, number of passive reflection units, distance between the base station and the IRS, distance between the IRS and the user, power of additive noise, and power of amplified noise.

[0045] In some embodiments, in step S03,

[0046] When the achievable rate V is greater than the transmission rate threshold Vth, the number of active reflection units Na is halved;

[0047] When the achievable rate V is less than the transmission rate threshold Vth, the number of passive reflection units Np is halved.

[0048] In some embodiments, in step S04, when the number of active reflection units Na or the number of passive reflection units Np is equal to 1, special processing is performed to set Na or Np to 0 and set the number of reflection units of another mode to N.

[0049] In some embodiments, step S06 is further included, after reaching a configuration that meets the transmission rate requirement, keeping the current number of reflection units Na and Np in the active mode and the passive mode unchanged until the system parameters change.

[0050] Specifically, (3) the achievable rate V is compared with the threshold rate Vth: when V>Vth, the number of active IRS reflection units is halved, that is, Na=Na / 2, and Np=N-Na; when V<Vth, the number of passive IRS reflection units is halved, that is, Np=Np / 2, and Na=N-Np; when V=Vth, the number of active IRS reflection units Na and the number of passive IRS reflection units Np remain unchanged, and jump to (7);

[0051] (4) Determine whether Na or Np is equal to 1;

[0052] (5) When Na or Np is not equal to 1, perform operations (2) and (3);

[0053] (6) When Na or Np is equal to 1, if Na=1, set Na=0 and Np=N; if Np=1, set Np=0 and Na=N, and perform step (2);

[0054] (7)The loop ends.

[0055] In some other embodiments, a limited rate based IRS adaptive reflection system is provided, comprising:

[0056] An IRS reflection unit array, used to adjust the phase and amplitude of the reflection signal according to the control signal;

[0057] A control unit, used to set the total number N of IRS reflection units, and the initial number Na and Np of reflection units in the active mode and the passive mode, and set the transmission rate threshold Vth, and calculate the achievable rate V according to the current system parameters, compare the achievable rate V with the transmission rate threshold Vth, and dynamically adjust the number Na and Np of reflection units in the active mode and the passive mode;

[0058] The communication interface is used to receive information about changes in system parameters and transmit it to the control unit.

[0059] In other embodiments, a limited rate based IRS adaptive reflection system is provided, comprising a processor and a memory storing program instructions, wherein the processor is used to execute a limited rate based IRS adaptive reflection method as described in any of the above items when running the program instructions.

[0060] In other embodiments, an electronic device (eg, a mobile phone, a computer) is provided, comprising an IRS adaptive reflection system based on a limited rate as described above.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. An IRS adaptive reflection method based on a limited rate, characterized in that: include: S01, setting the total number N of IRS reflection units, as well as the initial number Na and Np of reflection units in active mode and passive mode, and setting the transmission rate threshold Vth; S02, calculating the achievable rate V according to the current system parameters; S03, comparing the achievable rate V with the transmission rate threshold Vth, and dynamically adjusting the number of reflection units Na and Np in the active mode and the passive mode according to the comparison result; S04. When Na or Np reaches a preset condition, special processing is performed and the achievable rate V is recalculated; S05. Repeat steps S02 to S04 until the transmission rate requirement is met.

2. The method according to claim 1, characterized in that In step S01, the initial numbers of reflection units Na and Np in the active mode and the passive mode are both set to N / 2.

3. The method according to claim 1, characterized in that In step S02, the achievable rate V is calculated taking into account the base station's transmit power, power amplification factor, channel gain factor, number of active reflection units, number of passive reflection units, distance between the base station and the IRS, distance between the IRS and the user, power of additive noise, and power of amplified noise.

4. The method according to claim 1, characterized in that: In step S03, When the achievable rate V is greater than the transmission rate threshold Vth, the number of active reflection units Na is halved; When the achievable rate V is less than the transmission rate threshold Vth, the number of passive reflection units Np is halved.

5. The method according to claim 1, characterized in that In step S04, when the number of active reflection units Na or the number of passive reflection units Np is equal to 1, a special process is performed to set Na or Np to 0 and set the number of reflection units of another mode to N.

6. The method according to claim 1, characterized in that The method further includes step S06, after reaching a configuration that meets the transmission rate requirement, keeping the current numbers of reflection units Na and Np in the active mode and the passive mode unchanged until the system parameters change.

7. An IRS adaptive reflection system based on a limited rate, characterized in that: include: An IRS reflection unit array, used to adjust the phase and amplitude of the reflection signal according to the control signal; A control unit, used to set the total number N of IRS reflection units, and the initial number Na and Np of reflection units in the active mode and the passive mode, and set the transmission rate threshold Vth, and calculate the achievable rate V according to the current system parameters, compare the achievable rate V with the transmission rate threshold Vth, and dynamically adjust the number Na and Np of reflection units in the active mode and the passive mode; The communication interface is used to receive information about changes in system parameters and transmit it to the control unit.

8. An IRS adaptive reflection system based on a limited rate, comprising a processor and a memory storing program instructions, characterized in that: The processor is used to execute the IRS adaptive reflection method based on a limited rate as described in any one of claims 1 to 6 when running the program instructions.

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