CN111010714B - Method for improving conversation quality of LTE system edge VoLTE voice user - Google Patents
Method for improving conversation quality of LTE system edge VoLTE voice user Download PDFInfo
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- CN111010714B CN111010714B CN201911191875.3A CN201911191875A CN111010714B CN 111010714 B CN111010714 B CN 111010714B CN 201911191875 A CN201911191875 A CN 201911191875A CN 111010714 B CN111010714 B CN 111010714B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/26—Resource reservation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
Abstract
The invention discloses a method for improving the conversation quality of an edge VoLTE voice user of an LTE system. According to the invention, the experience of the edge VoLTE voice user of the LTE system is optimized from the base station L2 scheduling angle, so that the service of the edge VoLTE voice user is more smoothly carried out, the lifting effect can be seen from the RSRP reported by the UE and the downlink transmission BLER value measured and counted by the base station, or in the environment test process, the edge user (RSRP < = -95 dBm) is determined firstly, and then the actual conversation effect and the BLER value are observed from a far point. According to the invention, the performance is improved by improving the emission power of the downlink service channel of the VoLTE voice user in the edge of the LTE system and reserving the special RB function of the VoLTE voice user in the edge, the improvement effect can be seen from the RSRP reported by the UE and the downlink transmission BLER value counted by the base station side, or in the environment test process, the edge user (RSRP < = -95 dBm) is determined first, and then the actual conversation effect and the BLER value are observed from a far point.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a method for improving the conversation quality of an edge VoLTE voice user of an LTE system.
Background
The real-time requirement of the Voice over LTE (Voice over LTE) service in the 4G system is high, the service priority is also high, and ensuring the conversation experience of the Voice over LTE user is very important for operators.
For example, the invention patent with the publication number of CN102421179A discloses a downlink power control method of an LTE system, which divides a cell into a concentric center area and an edge area according to different distances from a base station, and comprises the steps of setting the maximum value and the minimum value of the transmission power of a resource block used by an edge area terminal, measuring the path loss difference value between the edge area terminal and the base station of the cell and the nearest neighboring base station, distributing different transmission power for the resource block used by each edge area terminal according to the different path loss difference value, subtracting the sum of the transmission powers of the resource blocks used by the edge area terminal, and equally distributing the resource blocks used by the center area terminal. The power of the cell user is determined by the position of the cell user, under the condition that overload indication (0I) or high interference indicator (HI) is not received, the transmitting power is preferentially ensured to meet the requirement, and when II I or HII is received, the value B can be adjusted to properly reduce the power, and the control flexibility of the downlink power is high.
At least the following problems exist in the prior art:
in the prior art, the existing LTE base station is developed based on the 3GPP protocol, the 3GPP protocol does not normalize the scenario described in the patent, and when the UE is at the cell edge or the signal is bad, the VoLTE voice function of the UE performs poorly, which affects the user experience.
Aiming at the problems that the VoLTE voice function of the UE performs poorly and influences the user experience when the UE is at the cell edge or the signal is poor in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a method for improving the conversation quality of Voice over LTE (Voice over LTE) at the edge of an LTE (Long Term Evolution long term evolution) system.
Step 1, judging an edge user and an edge VoLTE voice user;
step 2, power boost of the edge Volte voice user is realized in downlink scheduling based on a base station L2 (Layer 2, data link Layer);
and 3, scheduling special RB (Resource Block) of the edge Volte voice user, wherein the base station reserves special RB resources for scheduling the edge VoLTE voice user.
Further, in step 1, the method further comprises the following steps:
step 1.1, edge user judgment:
step 1.1.1, configuring a base station to enable a UE (User Equipment) to measure an event periodically by RSRP (Reference Signal Receiving Power, reference signal received power), wherein a reporting period is configured to be 2048ms;
step 1.1.2, the UE accesses the base station, in the access process, the base station issues the UE periodic RSRP measurement event to the UE through the reconfiguration signaling, after the UE takes effect, the UE periodically reports Measurement Report (measurement report) containing the RSRP value to the base station;
step 1.1.3, the base station acquires Measurement Report containing the RSRP value in real time;
step 1.1.4, when the base station adds an edge UE flag UeEdgeFlag, ueEdgeFlag value of 1 to UE instance information, the base station indicates edge UE, and when the base station is powered on, a program module is loaded, and when software is subjected to system initialization, the UeEdgeFlag value is cleared;
step 1.1.5, the base station analyzes Measurement Report to obtain the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is smaller than-95 dBm and the UeEdgeFlag value is 0, the base station L3 (Layer 3, network Layer) informs the base station L2 to update the UeEdgeFlag value in the UE instance to be 1;
step 1.1.7, when the RSRP value analyzed by the base station is greater than-80 dBm and the UeEdgeFlag value is 1, the base station L3 informs the base station L2 to update the UeEdgeFlag value in the UE example to be 0;
step 1.2, judging an edge Volte voice user, wherein in a CMAC software module, after the UE is accessed to a base station, a UE related information list is established, and when a service with QCI (QoS Class Identifier, quality of service class) grade of 1 exists, the UE is judged to be the edge Volte voice user;
further, in step 2, the method further comprises the following steps:
step 2.1, a scheduler in the base station selects a UE to be scheduled in a TTI (Transmission Time Interval ), determines whether the UE to be scheduled in the TTI is an edge Volte voice user, and calculates an RB to be reserved in the TTI without scheduling:
step 2.1.1, set that total Nt voice users belonging to edge Volte in the UE of TTI selected scheduling: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, nboost being the number of edge Volte voice user equipment UE which can boost power in the TTI, nres being the number of RBs which do not need to be scheduled in the TTI, and selecting the UE scheduled in the TTI;
step 2.1.3, when Nt is smaller than or equal to NB/X, the number Nboost of edge Volte voice users UE of the TTI capable of improving power is the number Nt of the edge Volte voice users, wherein when the cell bandwidth is set to be 20M, the value of X is 25, and the value of Nboost is 1-4;
step 2.1.4, when Nt is larger than NB/X, the number Nboost of the edge Volte voice user UE of the TTI capable of improving the power is the number NB/X of the downlink RBs of the cell, wherein when the cell bandwidth is set to be 20M, the value of X is 25, and the value of Nboost is 4;
step 2.2, after the downlink scheduling of the L2 CMAC module is completed, before the TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Volte voice user and the number of the UE with TTI lifting power is smaller than Nboost, lifting the downlink transmitting power of the UE, wherein the downlink transmitting power of the UE is lifted by 3db;
further, in step 3, the method further comprises the following steps:
step 3.1, judging the edge Voltem voice special scheduling UE:
step 3.1.1, starting a BLER (Block Error Rate) updating timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of the edge Volte voice user, and judging whether the BLER value exceeds a threshold 3, wherein the threshold 3 takes a value of 5%;
step 3.1.2, when the BLER value of the edge Volter voice user exceeds a threshold 3, marking the edge Volter voice special scheduling UE;
and 3.2, allocating special RB resources, wherein in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Volte voice special scheduling UE is 1 and the number of the scheduled RBs is smaller than or equal to the number of the rest reserved RBs, the special RB resources are allocated to the PDSCH (Physical Downlink Shared Channel ) of the scheduled edge Volte voice special scheduling UE.
Further, the reporting period configuration in step 1.1.1 further includes 1024ms or 5120ms.
Further, in step 1.1.5, the base station analyzes and decides the RSRP value of Measurement Report through the L3 layer, updates the UeEdgeFlag value, and the CMAC module compares the RSRP value with the current UeEdgeFlag state to determine whether the UE is in the UeEdgeFlag state, and updates the UeEdgeFlag value through the L2 layer.
Further, in step 1.1.5, the base station analyzes the RSRP value of Measurement Report through the L3 layer, and determines the RSRP value and updates the UeEdgeFlag value through the L2 layer.
Further, in step 2.1, when the cell bandwidth is 20MHz, the maximum value of Nboost is 4, that is, the cell supports at most 4 edge Volte voice users per TTI to boost the downlink transmit power.
Further, in step 3, the base station network management software is configured to configure the number of dedicated RBs and the dedicated RB location for edge Volte voice dedicated RB scheduling.
Further, in step 3, dedicated RB scheduling of the edge Volte voice user, one is that the base station reserves dedicated RB resources only for scheduling of the edge voice user Volte service, and another meaning is that for the same TTI, the edge voice user Volte service is scheduled onto the dedicated RB resources.
Further, in step 3.1.1, the AN counter and the BLER value are initialized while the BLER update timer is started.
Further, in step 3, the opening of the special RB function of the edge Volte voice and the position selection of the special RB all keep the unified configuration of the whole network.
Compared with the prior art, the method provided by the invention has the following remarkable and superior effects:
according to the invention, voLTE experience of the edge voice user is optimized from the base station L2 scheduling angle, so that VoLTE service of the edge voice user is more smoothly carried out, the lifting effect can be seen from RSRP reported by UE and a downlink transmission BLER value counted by a base station side, or in the environment test process, the edge user (RSRP < = -95 dBm) is determined firstly, and then the actual conversation effect and BLER value are observed from a far point.
2, the invention improves the performance of the edge voice user by improving the emission power of the downlink service channel of the VoLTE voice user and reserving the special RB function of the edge voice in the edge LTE system, the improvement effect can be seen from the RSRP reported by the UE and the downlink transmission BLER value counted by the base station side, or in the environment test process, the edge user (RSRP < = -95 dBm) is determined firstly, and then the actual conversation effect and the BLER value are observed from a far point.
Drawings
FIG. 1 is a flow chart of the overall process of downlink scheduling according to the method of the present invention;
fig. 2 is a flowchart of overall process of allocating dedicated RB resources according to the method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
The method comprises the following steps:
step 1, judging an edge user and an edge VoLTE voice user;
step 2, power boost of the edge Volte voice user is realized based on downlink scheduling of the base station L2;
and 3, dedicated RB scheduling of the edge Volte voice user, wherein a base station reserves dedicated RB resources for scheduling of the edge VoLTE voice user.
Further, in step 1, the method further comprises the following steps:
step 1.1, edge user judgment:
step 1.1.1, configuring a base station to enable a periodic RSRP measurement event of UE, wherein the reporting period is configured to be 2048ms;
step 1.1.2, the UE accesses the base station, in the access process, the base station transmits the UE periodic RSRP measurement event to the UE through the reconfiguration signaling, and after the UE is effective, the UE periodically reports Measurement Report containing the RSRP value to the base station;
step 1.1.3, the base station acquires Measurement Report containing the RSRP value in real time;
step 1.1.4, when the base station adds an edge UE flag UeEdgeFlag, ueEdgeFlag value of 1 to UE instance information, the base station indicates edge UE, and when the base station is powered on, a program module is loaded, and when software is subjected to system initialization, the UeEdgeFlag value is cleared;
step 1.1.5, the base station analyzes Measurement Report to obtain the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is smaller than-95 dBm and the UeEdgeFlag value is 0, the base station L3 informs the base station L2 to update the UeEdgeFlag value in the UE example to be 1;
step 1.1.7, when the RSRP value analyzed by the base station is greater than-80 dBm and the UeEdgeFlag value is 1, the base station L3 informs the base station L2 to update the UeEdgeFlag value in the UE example to be 0;
and 1.2, judging the edge Volte voice user, wherein in a CMAC software module, after the UE is accessed to a base station, a UE related information list is established, and when the service with the QCI grade of 1 exists, the UE is judged to be the edge Volte voice user.
Further, in step 2, the method further comprises the following steps:
step 2.1, a scheduler in the base station selects UE to be scheduled, determines whether the UE to be scheduled in the TTI is an edge Volten voice user, and calculates RB to be reserved in the TTI without scheduling:
step 2.1.1, set that total Nt voice users belonging to edge Volte in the UE of TTI selected scheduling: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, nboost being the number of edge Volte voice user equipment UE which can boost power in the TTI, nres being the number of RBs which do not need to be scheduled in the TTI, and selecting the UE scheduled in the TTI;
step 2.1.3, when Nt is smaller than or equal to NB/X, the number Nboost of edge Volte voice users UE of the TTI capable of improving power is the number Nt of the edge Volte voice users, wherein when the cell bandwidth is set to be 20M, the value of X is 25, and the value of Nboost is 1-4;
step 2.1.4, when Nt is greater than NB/X, the number Nboost of the edge Volte voice user UE of the TTI capable of improving the power is the number NB/X of the downlink RBs of the cell, wherein when the cell bandwidth is set to 20M, the value of X is 25, the value of Nboost is 4, and the number of RBs corresponding to the 20M cell bandwidth is 100;
and 2.2, after the downlink scheduling of the L2 CMAC module is completed, before the TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Volte voice user and the number of the UE with TTI lifting power is smaller than Nboost, lifting the downlink transmitting power of the UE, wherein the downlink transmitting power of the UE is lifted by 3db.
Further, in step 3, the method further comprises the following steps:
step 3.1, judging the edge Voltem voice special scheduling UE:
step 3.1.1, starting a BLER update timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of the edge Volte voice user, and judging whether the BLER value exceeds a threshold value of Thresm 3, wherein the threshold value of Thresm 3 is 5%;
step 3.1.2, when the BLER value of the edge Volter voice user exceeds a threshold 3, marking the edge Volter voice special scheduling UE;
and 3.2, allocating special RB resources, wherein in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Volte voice special scheduling UE is 1 and the number of the scheduled RBs is smaller than or equal to the number of the rest reserved RBs, the special RB resources are allocated to the PDSCH of the scheduled edge Volte voice special scheduling UE.
Further, in step 1.1.1, the reporting period configuration further includes 1024ms or 5120ms.
Further, in step 1.1.5, the base station performs RSRP value analysis and decision on Measurement Report through the L3 layer.
Further, in step 2.1, when the cell bandwidth is 20MHz, the maximum value of Nboost is 4, that is, the cell supports at most 4 edge Volte voice users per TTI to boost the downlink transmit power.
Further, in step 3, the base station network management software is configured to configure the number of dedicated RBs and the dedicated RB location for edge Volte voice dedicated RB scheduling.
Further, in step 3.1.1, the AN counter and the BLER value are initialized while the BLER update timer is started.
Further, in step 3, the opening of the special RB function of the edge Volte voice and the position selection of the special RB all keep the unified configuration of the whole network.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made by those skilled in the art without departing from the spirit and principles of the present invention, and any modifications, equivalent substitutions, improvements, etc. should be included in the scope of the present invention as defined in the appended claims.
Claims (8)
1. The method for improving the conversation quality of the LTE system edge VoLTE voice user is characterized by comprising the following steps:
step 1, judging an edge user and an edge VoLTE voice user:
step 1.1, edge user judgment:
step 1.1.1, configuring a base station to enable a periodic RSRP measurement event of UE, wherein the reporting period is configured to be 2048ms;
step 1.1.2, the UE accesses the base station, in the access process, the base station transmits the UE periodic RSRP measurement event to the UE through the reconfiguration signaling, and after the UE is effective, the UE periodically reports Measurement Report containing the RSRP value to the base station;
step 1.1.3, the base station acquires Measurement Report containing the RSRP value in real time;
step 1.1.4, when the base station adds an edge UE flag UeEdgeFlag, ueEdgeFlag value of 1 to UE instance information, the base station indicates edge UE, and when the base station is powered on, a program module is loaded, and when software is subjected to system initialization, the UeEdgeFlag value is cleared;
step 1.1.5, the base station analyzes Measurement Report to obtain the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is smaller than-95 dBm and the UeEdgeFlag value is 0, the base station L3 informs the base station L2 to update the UeEdgeFlag value in the UE example to be 1;
step 1.1.7, when the RSRP value analyzed by the base station is greater than-80 dBm and the UeEdgeFlag value is 1, the base station L3 informs the base station L2 to update the UeEdgeFlag value in the UE example to be 0;
step 1.2, judging an edge Volte voice user, wherein in a CMAC software module, after UE is accessed to a base station, a UE related information list is established, and when a service with QCI grade of 1 exists, the UE is judged to be the edge Volte voice user;
step 2, power boost of the edge Volte voice user is realized in downlink scheduling based on the base station L2:
step 2.1, a scheduler in the base station selects UE to be scheduled, determines whether the UE to be scheduled in the TTI is an edge Volten voice user, and calculates RB to be reserved in the TTI without scheduling:
step 2.1.1, set that total Nt voice users belonging to edge Volte in the UE of TTI selected scheduling: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, nboost being the number of edge Volte voice user equipment UE which can boost power in the TTI, nres being the number of RBs which do not need to be scheduled in the TTI, and selecting the UE scheduled in the TTI;
step 2.1.3, when Nt is smaller than or equal to NB/X, the number Nboost of edge Volte voice users UE of the TTI capable of improving power is the number Nt of the edge Volte voice users, wherein when the cell bandwidth is set to be 20M, the value of X is 25, and the value of Nboost is 1-4;
step 2.1.4, when Nt is larger than NB/X, the number Nboost of the edge Volte voice user UE of the TTI capable of improving the power is the number NB/X of the downlink RBs of the cell, wherein when the cell bandwidth is set to be 20M, the value of X is 25, and the value of Nboost is 4;
step 2.2, after the downlink scheduling of the L2 CMAC module is completed, before the TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Volte voice user and the number of the UE with TTI lifting power is smaller than Nboost, lifting the downlink transmitting power of the UE, wherein the downlink transmitting power of the UE is lifted by 3db;
and 3, dedicated RB scheduling of the edge Volte voice user, wherein a base station reserves dedicated RB resources for scheduling of the edge VoLTE voice user.
2. The method for improving the call quality of the edge VoLTE voice user of the LTE system according to claim 1, wherein in step 3, further comprising the steps of:
step 3.1, judging the edge Voltem voice special scheduling UE:
step 3.1.1, starting a BLER update timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of the edge Volte voice user, and judging whether the BLER value exceeds a threshold value of Thresm 3, wherein the threshold value of Thresm 3 is 5%;
step 3.1.2, when the BLER value of the edge Volter voice user exceeds a threshold 3, marking the edge Volter voice special scheduling UE;
and 3.2, allocating special RB resources, wherein in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Volte voice special scheduling UE is 1 and the number of the scheduled RBs is smaller than or equal to the number of the rest reserved RBs, the special RB resources are allocated to the PDSCH of the scheduled edge Volte voice special scheduling UE.
3. The method for improving the call quality of an LTE system edge VoLTE voice user according to claim 1, wherein in step 1.1.1, the reporting period configuration further includes 1024ms or 5120ms.
4. The method for improving the call quality of the edge VoLTE voice user of the LTE system according to claim 1, wherein in step 1.1.5, the base station performs the analysis and the decision of the RSRP value of Measurement Report through the L3 layer.
5. The method for improving the call quality of the edge VoLTE voice users of the LTE system according to claim 1, wherein in step 2.1, when the cell bandwidth is 20MHz, the maximum value of Nboost is 4, that is, the cell supports at most 4 edge VoLTE voice users per TTI to improve the downlink transmission power.
6. The method for improving call quality of an edge VoLTE voice subscriber of an LTE system according to claim 2, wherein in step 3, the base station network management software is configured to configure the number of dedicated RBs and the dedicated RB location of the edge VoLTE voice dedicated RB schedule.
7. The method for improving the call quality of the LTE system edge VoLTE voice user according to claim 2, wherein in step 3.1.1, the AN counter and the BLER value are initialized while the BLER update timer is started.
8. The method for improving the call quality of the edge VoLTE voice subscriber of the LTE system according to claim 2, wherein in step 3, the opening of the edge VoLTE voice dedicated RB function and the location selection of the dedicated RB are both maintained in a unified configuration of the whole network.
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