CN112153677A - Uplink AMC optimization method for small telephone traffic scene - Google Patents

Uplink AMC optimization method for small telephone traffic scene Download PDF

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CN112153677A
CN112153677A CN202010936641.3A CN202010936641A CN112153677A CN 112153677 A CN112153677 A CN 112153677A CN 202010936641 A CN202010936641 A CN 202010936641A CN 112153677 A CN112153677 A CN 112153677A
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mcs
uplink
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sinr
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龚园园
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Beijing Changkun Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses an uplink AMC optimization method for a small telephone traffic scene. The method comprises the following steps: step 1, a base station measures SINR of an uplink receiving signal based on DMRS or SRS sent by UE; step 2, the base station obtains an initial MCS through an SINR and MCS mapping table; step 3, the base station obtains the uplink delta MCS of the UE according to the decoding result of the uplink signal; step 4, obtaining MCS used for UE uplink data transmission according to the initial MCS and the delta MCS; step 5, calculating the number of RBs distributed to the UE by using the MCS of the AMC and the PHR and BSR fed back by the UE; and 6, judging whether the condition for the small telephone traffic scene is met. The method of the invention has the advantages that: when the UE transmission power is limited, namely the expected transmission power of the UE is more than or equal to the maximum transmission power of the UE, the delta MCS calculated in the AMC process is more effectively utilized, the application of the delta MCS in MCS adjustment is reserved, and the base station is also provided to adjust the number of uplink wireless physical resource blocks allocated to the user.

Description

Uplink AMC optimization method for small telephone traffic scene
Technical Field
The invention belongs to the technical field of communication, and particularly relates to an uplink AMC (adaptive modulation coding) optimization method for a small telephone traffic scene.
Background
Currently, an Adaptive Modulation and Coding (AMC) technique is an Adaptive technique that adaptively selects a Modulation and Coding Scheme (MCS) according to a wireless channel state on the premise of ensuring reliability of a wireless communication system, so as to improve throughput of the wireless communication system. Taking Long Term Evolution (LTE) system as an example, in the prior art, after an evolved NodeB (eNB) receives a Reference Signal sent by a User Equipment (UE), such as a channel Sounding Reference Signal (SRS) or a Demodulation Reference Signal (DMRS), an uplink Signal to Interference and Noise Ratio (SINR) is measured according to the Reference Signal, when the UE is scheduled, the base station uses the uplink SINR as a predicted value of SINR for actual data Transmission of the UE after a number of Transmission Time Intervals (TTIs), and outputs an initial MCS requiring AMC according to the predicted value of SINR and a corresponding relationship between the uplink SINR and the uplink MCS. The base station obtains the adjustment quantity delta MCS of the AMC initial MCS according to the historical demodulation condition of the uplink data, and the initial MCS and the delta MCS jointly determine the MCS adopted by the actual data transmission.
For example, the patent application No. 2011100341036 provides an adaptive modulation and coding method and device, including: transmitting a pilot signal to a terminal; receiving a channel quality indication fed back by the terminal after the terminal carries out channel measurement according to the pilot signal; and selecting a modulation coding mode from a modified modulation coding Mode (MCS) table according to the channel quality indication, and sending data according to the modulation coding mode. The adaptive modulation and coding method and the device support the highest modulation mode of 256QAM on the basis of the existing modulation mode which supports 64QAM at the highest. For example, the patent application with application number 2016107869159 provides an adaptive modulation coding method based on a difference between a double block error rate and a signal-to-noise ratio, which uses the current total PER, segment PER and SNR difference of the system as the basis for judgment, and adaptively adjusts the upper and lower thresholds of the segment PER according to the channel condition under the condition that the system satisfies reliable transmission, so as to more reasonably adapt to the changing condition of the channel in the transmission process of communication data, and change the MCS of the system in real time, so that the total block error rate of the system satisfies the index requirement.
In summary, the base station uses the MCS output by the AMC and the bsr (buffer Status report) reported by the UE, and some other UE reporting results (remaining transmit Power reported by the UE, Power Head Room, PHR), calculates the number of Resource Blocks (RBs) allocated to the UE, when the UE is far away from the base station and the desired transmit Power is greater than or equal to the maximum transmit Power, the number of physical Resource blocks occupied by the UE for transmitting signals directly affects the SINR received by the base station, and when the Resource Block number calculation result is not appropriate, the UE may fail in wireless connection due to too low SINR.
Disclosure of Invention
The present invention aims to provide an uplink AMC optimization method for small traffic scenarios that can overcome the above technical problems, the method comprising the following steps:
step 1, the base station measures the SINR of the uplink received signal based on the DMRS or SRS sent by the UE.
Step 2, the base station obtains an initial MCS through the mapping relation between the SINR and the MCS, wherein the mapping relation between the SINR and the MCS is the reaction of the demodulation capacity of the physical layer of the wireless communication, and the mapping relation is obtained through actually testing the demodulation capacity of the physical layer of the base station and can also be obtained through a simulation modeling mode;
and step 3, the base station receives and demodulates the uplink service signal sent by the UE, when the demodulation and decoding result passes Cyclic Redundancy Check (CRC), the base station successfully demodulates the uplink data sent by the UE, otherwise, the base station fails to receive the data, the CRC of the uplink data passes, the base station increases the size of delta MCS, otherwise, the size of the delta MCS is reduced, and the initialization value of the delta MCS is 0.
And step 4, obtaining the Modulation and Coding Scheme (MCS) used by the UE uplink data transmission according to the initial MCS and the delta MCS.
And step 5, the BSR reported by the UE informs the base station of how much data needs to be transmitted in the uplink, and the result of the base station MCS accounting shows what modulation coding rate can be used for transmitting data, so that the base station can calculate how many physical Resource Blocks (RBs) need to be used for carrying the uplink data.
Step 6, judging whether the condition for the small telephone traffic scene is satisfied, namely the service of the UE is the small telephone traffic service and satisfies the following conditions:
(PHR≤PHRlimit)&(MCS≤MCSlimit)&(NRB≥NRBlimit)&(ΔMCS≤ΔMCSlimit)，
when the condition is met, adjusting the number of uplink RBs allocated to the UE according to the value of the delta MCS:
step 6.1, the conditions mentioned in step 6 are described in detail below:
step 6.1.1, the used scene is that the UE is a UE with small telephone traffic, such as a UE of a voice Service (CS);
step 6.1.2, UE has no residual transmitting power, when the maximum transmitting power of UE is 23dBm, PHR is setlimit23 PHR is not more than PHRlimit；
Step 6.1.3, the uplink MCS obtained by AMC is less than or equal to MCSlimitE.g. MCSlimit1, namely, the uplink MCS is already low at the moment and the wireless channel is resisted by reducing the MCS without excessive margin;
step 6.1.4, the number of uplink resource blocks calculated according to the BSR is more than or equal to NRBlimitValue is NRBlimit＝6；
Step 6.1.5, uplink delta MCS calculated in AMC process is less than or equal to delta MCSlimitValue of Δ MCSlimit＝-2；
Step 6.2, after the condition of step 6.1 is satisfied, after the AMC module obtains the MCS and the number of RBs obtained by resource allocation, the number of RBs is adjusted, and the number of RBs is adjusted to reduce the number of times of uplink demodulation errors (CRC errors) caused by the deterioration of the wireless channel condition;
the RB number adjustment method comprises the following steps: Δ MCS is lowered by one order, the desired received SINR is increased by 2dB, the SINR is increased by 2dB (SINR)adjust_dB2dB), a transmit power increase on each RB in the uplink is required
Figure BDA0002672166950000031
Since the UE has no remaining power and the UE transmission power is not changed, the uplink transmission power per RB is increased by reducing the number of uplink RBs, and therefore, the number of RBs needs to be reduced
Figure BDA0002672166950000032
Multiple, i.e. delta MCS ratio0 to 1, the number of RBs needs to be reduced
Figure BDA0002672166950000033
Multiple of, wherein SINRadjust_dB＝2dB。
The method of the invention has the advantages that:
1. the method of the invention utilizes the delta MCS calculated in the AMC process more effectively when the UE transmission power is limited, namely the expected transmission power of the UE is more than or equal to the maximum transmission power, and the delta MCS is only used for adjusting the MCS of the user in the common practice.
2. The method of the invention not only reserves the application of delta MCS in MCS adjustment, but also provides the method which is used by the base station for adjusting the number of the uplink wireless physical resource blocks allocated to the user, when the channel condition is worsened, the attenuation of the wireless channel can not be resisted by improving the sending power of the user, and at the moment, the number of the wireless resource blocks allocated to the user in one uplink scheduling is reduced through the value of the delta MCS so as to improve the received SINR.
3. The method of the invention guarantees the Quality of Service (QoS) of the user through multiple times of scheduling, and reduces the probability of call drop of the user due to the coverage edge of the cell.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. As shown in figure 1 of the drawings, in which,
the method comprises the following steps:
step 1, the base station measures the SINR of the uplink received signal based on the DMRS or SRS sent by the UE.
Step 2, the base station obtains an initial MCS through the mapping relation between the SINR and the MCS, wherein the mapping relation between the SINR and the MCS is the reaction of the demodulation capacity of the physical layer of the wireless communication, and the mapping relation is obtained through actually testing the demodulation capacity of the physical layer of the base station and can also be obtained through a simulation modeling mode;
and step 3, the base station receives and demodulates the uplink service signal sent by the UE, when the demodulation and decoding result passes Cyclic Redundancy Check (CRC), the base station successfully demodulates the uplink data sent by the UE, otherwise, the base station fails to receive the data, the CRC of the uplink data passes, the base station increases the size of delta MCS, otherwise, the size of the delta MCS is reduced, and the initialization value of the delta MCS is 0.
And step 4, obtaining the Modulation and Coding Scheme (MCS) used by the UE uplink data transmission according to the initial MCS and the delta MCS.
And step 5, the BSR reported by the UE informs the base station of how much data needs to be transmitted in the uplink, and the result of the base station MCS accounting shows what modulation coding rate can be used for transmitting data, so that the base station can calculate how many physical Resource Blocks (RBs) need to be used for carrying the uplink data.
Step 6, judging whether the condition for the small telephone traffic scene is satisfied, namely the service of the UE is the small telephone traffic service and satisfies the following conditions:
(PHR≤PHRlimit)&(MCS≤MCSlimit)&(NRB≥NRBlimit)&(ΔMCS≤ΔMCSlimit)，
when the condition is met, adjusting the number of uplink RBs allocated to the UE according to the value of the delta MCS:
step 6.1, the conditions mentioned in step 6 are described in detail below:
step 6.1.1, the used scene is that the UE is a UE with small telephone traffic, such as a UE of a voice Service (CS);
step 6.1.2, UE has no residual transmitting power, when the maximum transmitting power of UE is 23dBm, PHR is setlimit23 PHR is not more than PHRlimit；
Step 6.1.3, the uplink MCS obtained by AMC is less than or equal to MCSlimitE.g. MCSlimit1, namely, the uplink MCS is already low at the moment and the wireless channel is resisted by reducing the MCS without excessive margin;
step 6.1.4, the number of uplink resource blocks calculated according to the BSR is more than or equal to NRBlimitValue is NRBlimit＝6；
Step 6.1.5, uplink delta MCS calculated in AMC process is less than or equal to delta MCSlimitValue ofIs Δ MCSlimit＝-2；
Step 6.2, after the condition of step 6.1 is satisfied, after the AMC module obtains the MCS and the number of RBs obtained by resource allocation, the number of RBs is adjusted, and the number of RBs is adjusted to reduce the number of times of uplink demodulation errors (CRC errors) caused by the deterioration of the wireless channel condition;
the RB number adjustment method comprises the following steps: Δ MCS is lowered by one order, the desired received SINR is increased by 2dB, the SINR is increased by 2dB (SINR)adjust_dB2dB), a transmit power increase on each RB in the uplink is required
Figure BDA0002672166950000041
Since the UE has no remaining power and the UE transmission power is not changed, the uplink transmission power per RB is increased by reducing the number of uplink RBs, and therefore, the number of RBs needs to be reduced
Figure BDA0002672166950000051
Doubling, i.e. Δ MCS being 1 lower than 0, requires reducing the number of RBs
Figure BDA0002672166950000052
Multiple of, wherein SINRadjust_dB＝2dB。
The method of the invention provides value suggestion and acquisition method of each parameter of the table, and is not limited to the parameter value in the table in practical implementation.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the present disclosure should be covered within the scope of the present invention claimed in the appended claims.

Claims (2)

1. An uplink AMC optimization method for a small traffic scene is characterized by comprising the following steps:
step 1, a base station measures SINR of an uplink receiving signal based on DMRS or SRS sent by UE;
step 2, the base station obtains an initial MCS through the mapping relation between the SINR and the MCS, wherein the mapping relation between the SINR and the MCS is the reaction of the demodulation capacity of the physical layer of the wireless communication, and the mapping relation is obtained through actually testing the demodulation capacity of the physical layer of the base station and can also be obtained through a simulation modeling mode;
step 3, the base station receives and demodulates the uplink service signal sent by the UE, when the demodulation decoding result passes the cyclic redundancy check, the base station successfully demodulates the uplink data sent by the UE, otherwise, the data reception of the base station fails, the uplink data CRC check passes, the base station increases the size of delta MCS, otherwise, the size of the delta MCS is reduced, and the initialization value of the delta MCS is 0;
step 4, obtaining the modulation coding Mode (MCS) used by the UE uplink data transmission according to the initial MCS and the delta MCS;
step 5, the BSR reported by the UE informs the base station of how much data needs to be transmitted in the uplink, and the result of the base station MCS accounting shows what modulation coding rate can be used to transmit data, so that the base station can calculate how many physical resource blocks need to be used to carry the uplink data;
step 6, judging whether the condition for the small telephone traffic scene is satisfied, namely the service of the UE is the small telephone traffic service and satisfies the following conditions:
(PHR≤PHRlimit)&(MCS≤MCSlimit)&(NRB≥NRBlimit)&(ΔMCS≤ΔMCSlimit)，
and when the condition is met, adjusting the number of uplink RBs distributed to the UE according to the value of the delta MCS.
2. The uplink AMC optimization method according to claim 1, wherein step 6 comprises the following steps:
step 6.1, the conditions mentioned in step 6 are described in detail below:
step 6.1.1, the used scene is that the UE is the UE with small telephone traffic;
step 6.1.2, UE has no residual transmitting power, when the maximum transmitting power of UE is 23dBm, PHR is setlimit23 PHR is not more than PHRlimit；
Step 6.1.3, uplink MCS obtained by AMC is smallEqual to MCSlimitThat is, it indicates that the uplink MCS is already low and there is no excessive margin to resist the fading of the wireless channel by lowering the MCS;
step 6.1.4, the number of uplink resource blocks calculated according to the BSR is more than or equal to NRBlimitValue is NRBlimit＝6；
Step 6.1.5, uplink delta MCS calculated in AMC process is less than or equal to delta MCSlimitValue of Δ MCSlimit＝-2；
Step 6.2, after the condition of step 6.1 is satisfied, after the AMC module obtains the MCS and the number of RBs obtained by resource allocation, the number of RBs is adjusted, and the number of RBs is adjusted to reduce the number of uplink demodulation errors caused by the deterioration of the wireless channel condition;
the RB number adjustment method comprises the following steps: Δ MCS is lowered by one order, the desired received SINR is increased by 2dB, the SINR is increased by 2dB (SINR)adjust_dB2dB), a transmit power increase on each RB in the uplink is required
Figure FDA0002672166940000021
Since the UE has no remaining power and the UE transmission power is not changed, the uplink transmission power per RB is increased by reducing the number of uplink RBs, and therefore, the number of RBs needs to be reduced
Figure FDA0002672166940000022
Doubling, i.e. Δ MCS being 1 lower than 0, requires reducing the number of RBs
Figure FDA0002672166940000023
Multiple of, wherein SINRadjust_dB＝2dB。
CN202010936641.3A 2020-09-08 2020-09-08 Uplink AMC optimization method for small telephone traffic scene Pending CN112153677A (en)

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* Cited by examiner, † Cited by third party
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CN113596881A (en) * 2021-07-30 2021-11-02 西安抱朴通信科技有限公司 Base station side PHR optimization method, storage medium, electronic device and base station
CN116963248A (en) * 2023-09-20 2023-10-27 深圳国人无线通信有限公司 Uplink channel power control method and base station based on AMC algorithm

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CN113596881A (en) * 2021-07-30 2021-11-02 西安抱朴通信科技有限公司 Base station side PHR optimization method, storage medium, electronic device and base station
CN116963248A (en) * 2023-09-20 2023-10-27 深圳国人无线通信有限公司 Uplink channel power control method and base station based on AMC algorithm
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Application publication date: 20201229