CN117693047A - Physical downlink shared channel PDSCH scheduling method - Google Patents
Physical downlink shared channel PDSCH scheduling method Download PDFInfo
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Abstract
The invention discloses a PDSCH scheduling method, which comprises the following steps: obtaining reference signal receiving power RSRP according to the reference signal transmitting power, the reporting power margin PH of the user terminal UE and the maximum transmitting power Pmax; judging according to the value of Reference Signal Received Power (RSRP); judging the obtained channel quality indication CQI and rank indication RI; processing the obtained channel quality indication CQI and RI; determining RI and modulation and coding strategy MCS of PDSCH scheduling, wherein the PDSCH scheduling method solves the problems of high error rate and higher packet loss rate of PDSCH caused by inaccurate CSI reporting when UE is positioned at a far point or inaccurate CSI demodulation by a physical layer at a base station side in the prior art, reduces the packet error rate and packet loss rate of PDSCH, improves the downlink transmission rate, and further enhances the user experience; meanwhile, RSRP is used as a basis for CSI processing and is not influenced by adjustment of downlink transmitting power, so that the method has wider applicability.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and particularly relates to a Physical Downlink Shared Channel (PDSCH) scheduling method.
Background
In NR (New Radio, new air interface), since the transmission power of an NR terminal (User Equipment) is far smaller than the transmission power of a base station, the coverage of an uplink signal is often smaller than that of a downlink signal, so when the terminal is located at a far point of a cell, and PUSCH (Physical Uplink Shared Channel, uplink physical shared channel) or PUCCH (Physical Uplink Control Channel, uplink physical control channel) is transmitted with a larger bandwidth, there is a scenario that power is limited: as the number of scheduled RBs (Resource blocks) increases, the transmit power on each RB decreases, causing the received SINR to decrease.
In the prior art, the UE feeds back downlink CSI (Channel State Information ) information such as downlink CQI, RI, PMI through PUCCH or PUSCH, and according to 3GPP (3 rd Generation PartnershipProject, third generation partnership project) protocol, when the number of bits of CSI is less than 12 bits, there is no CRC (Cyclic Redundancy Check, cyclic redundancy check code) check, when the UE is located at a far point of a cell, since downlink coverage is greater than uplink coverage, the accuracy of CSI information measured by the UE is higher, but in the process of reporting to the base station through PUCCH or PUSCH, since the received SINR is lower, the CSI information demodulated by the base station side has no CRC check, the obtained demodulated CSI information appears in the form of an erroneous random value, but since there is no CRC check, the base station side has difficulty in judging the accuracy of the currently obtained CSI, and if the base station performs scheduling of PDSCH (Physical Downlink Shared Channel, downlink physical shared channel) according to the erroneous random CSI information, the PDSCH error rate is increased, further resulting in an increase in packet loss rate, and affecting the downlink traffic throughput and user experience of the UE.
When the CSI does not have CRC, how to obtain more accurate downlink CSI information and ensuring the performance of the far-point UE are problems to be solved.
Based on the technical problems existing in the prior art, the invention provides a physical downlink shared channel PDSCH scheduling method.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a physical downlink shared channel PDSCH scheduling method, which aims at solving the problem that the PDSCH of a remote point UE has high error code and high packet loss caused by the fact that the UE obtained by demodulation at a base station side reports a random value with probability of error of CSI information in the prior art.
The invention adopts the following technical scheme:
a physical downlink shared channel PDSCH scheduling method includes:
step 1, obtaining reference signal receiving power RSRP according to reference signal transmitting power Reference Signal Power and a power allowance PH and a maximum transmitting power Pmax reported by user terminal UE;
step 2, judging according to the value of the reference signal received power RSRP: when the reference signal receiving power RSRP is larger than the threshold Th1, the channel quality indication CQI and the rank indication RI obtained by the MAC of the multiple access channel are considered to be accurate, and the step 5 is carried out; when the reference signal received power RSRP is smaller than or equal to the threshold value Th1 and larger than or equal to the threshold value Th2, step 3 is entered; otherwise, enter step 4;
step 3, judging the obtained channel quality indication CQI (Channel quality indicator) and rank indication RI (Rank Indicator): when the rank indication RI is smaller than or equal to a first rank indication threshold RITh1 and the channel quality indication CQI is smaller than or equal to a first channel quality indication threshold CQIth1, not processing; otherwise, setting the obtained rank indication RI and channel quality indication CQI as a first constant Cont11 and a second constant Cont21 respectively;
step 4, processing the obtained channel quality indication CQI and rank indication RI: when the rank indication RI is smaller than or equal to a second rank indication threshold RITh2 and the CQI is smaller than or equal to a second channel quality indication threshold CQIth2, the processing is not performed; otherwise, setting the obtained rank indication RI and channel quality indication CQI to a third constant value Cont12 and a fourth constant value Cont22, respectively, wherein the second rank indication threshold RITh2 is smaller than the first rank indication threshold RITh1;
and step 5, performing smoothing filtering processing on the rank indication RI and the channel quality indication CQI, and further determining the RI and the modulation and coding strategy MCS of PDSCH scheduling.
Further, in step 1:
the MAC calculates the path loss PL according to the PH reported by the UE and the related information:
PH＝P max -(P O +10log 10 (2 u ·M)+α·PL+Δ TF +f)……(1)；
PL＝(P max -PH-P O -10log 10 (2 u ·M)-Δ TF -f)/α……(2)；
wherein PH is the power headroom of PUSCH, P max The maximum transmitting power reported by UE, M is the number of PUSCH scheduling RBs, and P O 、α、Δ TF F respectively represents the PUSCH nominal transmitting power, the path loss factor, the MCS-related power offset and the power adjustment quantity of the PUSCH;
from the transmission power (Reference Signal Power) and PL of the reference signal, the reference signal reception power RSRP is calculated:
RSRP＝Reference Signal Power-PL……(3)。
further, in step 1:
the reference signal received power RSRP is calculated from the transmit power (Reference Signal Power) and PL of the secondary synchronization signal SSS (Secondary SynchronizationSignal).
Further, in step 1:
the reference signal received power RSRP is calculated from the transmission powers reference signalpower and PL of the channel state information reference signal CSI-RS (Channel state information reference signal).
The beneficial effects of the invention are as follows:
according to the physical downlink shared channel PDSCH scheduling method, the RSRP of the position of the UE is calculated according to the power margin and the maximum transmitting power reported by the UE, and the RI and the MCS of PDSCH scheduling are determined after the downlink CSI information reported by the UE is processed according to the value range of the RSRP, so that the problems of high error rate and high packet loss rate of the PDSCH caused by inaccurate reporting of CSI when the UE is positioned at a far point or inaccurate demodulation of the CSI by a physical layer at a base station side in the prior art are solved, the packet error rate and the packet loss rate of the PDSCH are reduced, the downlink transmission rate is improved, and the user experience is further enhanced; meanwhile, RSRP is used as a basis for CSI processing and is not influenced by adjustment of downlink transmitting power, so that the method has wider applicability.
Drawings
Fig. 1 is a flowchart of a PDSCH scheduling method in an embodiment of the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, it being understood that the embodiments and features of the embodiments may be combined with each other without conflict.
Examples
As shown in fig. 1, the method for scheduling PDSCH of the physical downlink shared channel includes:
step S102, obtaining reference signal receiving power RSRP according to reference signal transmitting power (Reference Signal Power) and a power allowance PH reported by user terminal UE;
the power headroom PH is calculated using the following equation:
PH＝P max -(P O +10log 10 (2 u ·M)+α·PL+Δ TF +f)；
the MAC reports PH (Power Headroom) according to the UE, and calculates PL (Path Loss) by combining the following formula:
PL＝(PH-P max +P O +10log 10 (2 u ·M)-Δ TF -f)/α；
wherein PH is the power headroom of PUSCH, P max The maximum transmitting power reported by UE, M is the number of PUSCH scheduling RBs, and P O 、α、Δ TF F respectively represents the PUSCH nominal transmitting power, the path loss factor, the power offset related to the modulation and coding strategy MCS and the power adjustment quantity of the PUSCH, and mu is a parameter determined according to the subcarrier interval delta f, wherein the subcarrier interval delta f=2u.15kHz; in the process of calculating PL through the above formula, only PL is an unknown parameter;
and then, according to the transmission power (Reference Signal Power) and PL of the reference signal, the reference signal receiving power RSRP is calculated by combining the following formula:
RSRP＝＝Reference Signal Power-PL；
in the process of calculating the Reference Signal Received Power (RSRP) through the above method, only the Reference Signal Received Power (RSRP) is an unknown parameter;
illustratively, the transmit power of the reference signal (Reference Signal Power) is the transmit power of the secondary synchronization signal SSS (reference Signal Power);
illustratively, the transmit power of the reference signal (Reference Signal Power) is the transmit power of the channel state information reference signal CSI-RS (Channel state information reference signal) (Reference Signal Power);
step S104, judging according to the value of the reference signal received power RSRP:
when the reference signal received power RSRP is greater than the threshold Th1, the obtained channel quality indicator CQI and rank indicator RI are considered to be accurate, and the process goes to step S110;
when the reference signal received power RSRP is smaller than or equal to the threshold value Th1 and larger than or equal to the threshold value Th2, step S106 is entered;
otherwise, step S108 is entered;
as a specific implementation manner, when the signal power is lower than the threshold Th1, the probability of the channel quality indicator CQI/rank indicator RI error analyzed by the base station is lower, but exceeds the expectations; when the signal power is lower than a threshold Th2, the analyzed channel quality indicator CQI/rank indicator RI is in high probability error; wherein Th1 is larger than Th2;
step S106: processing the obtained channel quality indication CQI and rank indication RI;
when the rank indication RI is smaller than or equal to a first rank indication threshold RITh1 and the channel quality indication CQI is smaller than or equal to a first channel quality indication threshold CQIth1, not processing;
otherwise, setting the obtained rank indication RI and channel quality indication CQI as a first constant Cont11 and a second constant Cont21 respectively;
wherein the value of the first rank indication threshold RITh1 should be greater than or equal to 2, and exemplary, the first rank indication threshold RITh1 is set to 2;
as a specific embodiment, a larger value is selected from a plurality of channel quality indication CQI indexes corresponding to QPSK as the first channel quality indication threshold CQITh1;
illustratively, the first channel quality indication threshold CQITh1 is set to 8;
exemplary, the rank indication RI has a value of 1-4;
the first constant value Cont11 and the second constant value Cont21 are fixed values set in advance; to ensure performance, the values are generally conservative (i.e., relatively small), and illustratively, the first constant Cont11 and the second constant Cont21 are set to 1 and 5, respectively;
step S108: processing the obtained channel quality indication CQI and rank indication RI;
when the rank indication RI is smaller than or equal to a second rank indication threshold RITh2 and the channel quality indication CQI is smaller than or equal to a second channel quality indication threshold CQIth2, not processing;
otherwise, setting the obtained rank indication RI and channel quality indication CQI as a third constant Cont12 and a fourth constant Cont22 respectively;
it should be noted that, the value of the second rank indication threshold RITh2 should be smaller than the first rank indication threshold RITh1, and exemplary, RITh1 is set to 1;
as a specific embodiment, a smaller value is selected from a plurality of channel quality indication CQI indexes corresponding to QPSK as the second channel quality indication threshold CQITh2, and the minimum value of the channel quality indication CQI indexes is denoted as CQImin;
the third constant value Cont12 and the fourth constant value Cont22 are fixed values set in advance; in order to ensure performance, values are generally conservative;
illustratively, the third constant Cont12 is set to 1 and the fourth constant Cont22 is set to CQImin+1;
step S110: determining a rank indication RI and a modulation and coding strategy MCS of PDSCH scheduling;
as a specific embodiment, smoothing filtering is performed on the obtained rank indication RI and channel quality indication CQI, so as to determine the rank indication RI and modulation and coding strategy MCS of PDSCH scheduling.
In step S102 of the above embodiment, μ=1 when the subcarrier spacing is 30 kHz.
The present invention is not limited to the above-described embodiments, and the above-described embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims.
Claims (6)
1. The Physical Downlink Shared Channel (PDSCH) scheduling method is characterized by comprising the following steps:
step 1, obtaining reference signal receiving power RSRP according to reference signal transmitting power Reference Signal Power and a power allowance PH and a maximum transmitting power Pmax reported by user terminal UE;
step 2, judging according to the value of the reference signal received power RSRP: when the reference signal receiving power RSRP is larger than the threshold Th1, the channel quality indication CQI and the rank indication RI obtained by the MAC of the multiple access channel are considered to be accurate, and the step 5 is carried out; when the reference signal received power RSRP is smaller than or equal to the threshold value Th1 and larger than or equal to the threshold value Th2, step 3 is entered; otherwise, enter step 4;
step 3, judging the obtained channel quality indication CQI and rank indication RI: when the rank indication RI is smaller than or equal to a first rank indication threshold RITh1 and the channel quality indication CQI is smaller than or equal to a first channel quality indication threshold CQIth1, not processing; otherwise, setting the obtained rank indication RI and channel quality indication CQI as a first constant Cont11 and a second constant Cont21 respectively;
step 4, processing the obtained channel quality indication CQI and rank indication RI: when the rank indication RI is smaller than or equal to a second rank indication threshold RITh2 and the channel quality indication CQI is smaller than or equal to a second channel quality indication threshold CQIth2, not processing; otherwise, respectively setting the obtained RI and CQI as a third constant Cont12 and a fourth constant Cont22, wherein the second rank indication threshold RITh2 is smaller than the first rank indication threshold RITh1;
and step 5, performing smoothing filtering processing on the rank indication RI and the channel quality indication CQI, and further determining the rank indication RI and the modulation and coding strategy MCS of PDSCH scheduling.
2. The method for scheduling PDSCH of a physical downlink shared channel according to claim 1, wherein in step 1:
the power headroom PH is calculated using the following equation:
PH＝P max -(P O +10log 10 (2 u ·M)+α·PL+Δ TF +f)……(1)；
wherein PH is the power headroom of PUSCH, P max Is the maximum transmitting power of UE, M is the number of PUSCH scheduling RBs, and P O 、α、Δ TF And f respectively represent the PUSCH nominal transmission power, the path loss factor, the MCS-related power offset and the power adjustment quantity of the PUSCH.
3. The method for scheduling PDSCH of a physical downlink shared channel according to claim 2, wherein in step 1: the MAC calculates the path loss PL according to the reported power margin PH of the user terminal UE:
PL＝(PH-P max +P O +10log 10 (2 u ·M)-Δ TF -f)/α……(2)。
4. the method for scheduling PDSCH of a physical downlink shared channel according to claim 3, wherein in step 1: from the transmission powers Reference Signal Power and PL of the reference signals, reference signal reception power RSRP is calculated:
RSRP＝Reference Signal Power–PL……(3)。
5. the method for scheduling PDSCH of a physical downlink shared channel according to claim 1, wherein in step 1:
the reference signal received power RSRP is calculated from the transmission powers Reference Signal Power and PL of the secondary synchronization signal SSS.
6. The method for scheduling PDSCH of a physical downlink shared channel according to claim 1, wherein in step 1:
and calculating reference signal receiving power RSRP according to the transmission power reference signal SignalPower and PL of the channel state information reference signal CSI-RS.
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