CN111010714A - Method for improving call quality of VoLTE voice users at edge of LTE system - Google Patents
Method for improving call quality of VoLTE voice users at edge of LTE system Download PDFInfo
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- CN111010714A CN111010714A CN201911191875.3A CN201911191875A CN111010714A CN 111010714 A CN111010714 A CN 111010714A CN 201911191875 A CN201911191875 A CN 201911191875A CN 111010714 A CN111010714 A CN 111010714A
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- 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
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/14—Separate analysis of uplink or downlink
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- 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
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- 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
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Abstract
The invention discloses a method for improving the call quality of VoLTE voice users at the edge of an LTE system. The invention optimizes the experience of the LTE system edge VoLTE voice user from the scheduling angle of the base station L2, so that the service of the edge VoLTE voice user is more smoothly carried out, the improvement 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 is less than-95 dBm) is firstly determined, and then the actual call effect and the BLER value are observed after the edge user is far away from the remote point. The invention improves the performance by improving the downlink service channel emission power of the VoLTE voice user in the edge of the LTE system and reserving the special RB function of the VoLTE voice user at the edge, and 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 is less than-95 dBm) is firstly determined, and then the actual call effect and the BLER value are observed after the edge user is far away from the remote point.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a method for improving the call quality of VoLTE voice users at the edge of an LTE system.
Background
The Voice over LTE (Voice over LTE) service has a high real-time requirement in a 4G system, and the service priority is also high, so that it is very important for an operator to ensure the call experience of a VoLTE user.
For example, the invention patent with Chinese patent publication No. CN102421179A discloses a method for controlling downlink power of an LTE system, which divides a cell into a concentric central 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 transmitting power of a resource block used by an edge area terminal, measuring the difference of the path loss from the edge area terminal to the cell base station and to the nearest adjacent cell base station, distributing different transmitting power to the resource block used by each edge area terminal according to the difference of the path loss, subtracting the sum of the transmitting power of the resource block used by the edge area terminal, and distributing the sum to the resource block used by the central area terminal. According to the method, the power of the cell user is determined by the position, the transmission power is preferably guaranteed to meet the requirement under the condition that no overload indicator (0I) or high interference indicator (HI) is received, and when III or HII is received, the B value can be adjusted to reduce the power appropriately, so that the flexibility of downlink power control is high.
The prior art has at least the following problems:
in the prior art, the existing LTE base station is developed based on a 3GPP protocol, the 3GPP protocol does not standardize the scenario described in this patent, and when the UE is located at a cell edge or a signal is poor, the VoLTE voice function of the UE is poor in performance, which affects user experience.
Aiming at the problems that in the prior art, when the UE is located at the edge of a cell or signals are poor, the VoLTE voice function of the UE is poor in performance and affects user experience, an effective solution is not provided at present.
Disclosure of Invention
The invention aims to provide a method for improving the call quality of a Voice user at the edge of a Voice over LTE (Voice over LTE) system in view of the defects of the prior art.
Step 1, judging edge users and edge VoLTE voice users;
step 2, the power of the edge Voice users is increased, and the power increase of the edge Voice users is realized in the downlink scheduling based on a base station L2(Layer2, data Link Layer);
and 3, scheduling the special RB (Resource Block) of the edge Volte voice user, and reserving the special RB Resource for scheduling the edge VoLTE voice user by the base station.
Further, in step 1, the method further comprises the following steps:
step 1.1, judging edge users:
step 1.1.1, configuring a base station, enabling a UE (User Equipment) to periodically measure an RSRP (Reference Signal Receiving Power) measurement event, wherein the reporting period is configured to 2048 ms;
step 1.1.2, UE accesses a base station, in the accessing process, the base station issues a periodic RSRP measuring event of the UE to the UE through reconfiguration signaling, and after the UE takes effect, the UE periodically reports a Measurement Report containing the RSRP value to the base station;
step 1.1.3, the base station acquires a Measurement Report containing RSRP value in real time;
step 1.1.4, the base station adds an edge UE mark UeEdgeFlag in the UE instance information, if the UeEdgeFlag value is 1, the edge UE is represented, if the UeEdgeFlag value is 0, the non-edge UE is represented, and when the base station equipment is powered on and a program module is loaded, and when software carries out system initialization, the UeEdgeFlag value is reset;
step 1.1.5, the base station analyzes the Measurement Report, acquires the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is less than-95 dBm and the UeEdgeFlag value is 0, the base station L3(Layer3, network Layer) notifies 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 notifies the base station L2 to update the UeEdgeFlag value in the UE instance to be 0;
step 1.2, judging the edge Voice subscriber, in a CMAC software module, after the UE is accessed to a base station, establishing an information list related to the UE, and when a service with a QCI (quality of service Identifier) grade of 1 exists, judging the UE to be the edge Voice subscriber;
further, in step 2, the method further comprises the following steps:
step 2.1, the scheduler in the base station selects the UE to be scheduled in TTI (Transmission Time Interval), determines whether the UE to be scheduled in TTI is an edge voice user, and calculates the RB to be reserved in TTI that does not need to be scheduled:
step 2.1.1, setting N t of UE selected and scheduled by TTI, wherein the N t of UE belongs to edge Voice users: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely setting the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, Nboost as the number of UE of marginal Voice users capable of improving power of TTI, Nres as the number of RB which does not need to be scheduled in TTI, and selecting UE scheduled in TTI;
step 2.1.3, when Nt is less than or equal to NB/X, the number Nboost of the edge Voice user UE capable of improving power in TTI is the number Nt of the edge Voice user, wherein when the cell bandwidth is set to 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 edge Volte voice user UE capable of improving power in TTI is the cell downlink RB number NB/X, wherein when the cell bandwidth is set to 20M, the value of X is 25, and the value of Nboost is 4;
step 2.2, after the L2 CMAC module finishes downlink scheduling, before TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Voice user and the number of the UE for increasing the power of the TTI is less than Nboost, increasing the downlink transmission power of the UE, wherein the downlink transmission power of the UE is increased by 3 db;
further, in step 3, the method further comprises the following steps:
step 3.1, judging the edge Voice dedicated scheduling UE:
step 3.1.1, starting a Block Error Rate (BLER) update timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of an edge Volte voice user, and judging whether the BLER value exceeds a threshold Thrld3, wherein the value of Thrld3 is 5%;
step 3.1.2, when the BLER value of the edge Voice user exceeds a threshold Thrld3, marking the user as edge Voice special scheduling UE;
and 3.2, allocating the special RB resources, and in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Voice dedicated scheduling UE is 1 and the number of the scheduled RBs is less than or equal to the number of the remaining reserved RBs, allocating the special RB resources to the PDSCH (Physical Downlink shared channel) of the scheduled edge Voice dedicated scheduling UE.
Further, the reporting period configuration in step 1.1.1 further includes 1024ms or 5120 ms.
Further, in step 1.1.5, the base station analyzes and judges the RSRP value of the Measurement Report through the L3 layer, and 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 parses the RSRP value of the 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 voice users per TTI to boost the downlink transmission power.
Further, in step 3, the base station network management software is configured to configure the number of dedicated RBs and the location of dedicated RBs for edge voice dedicated RB scheduling.
Further, in step 3, dedicated RB scheduling for the edge voice user, one is that the base station reserves dedicated RB resources only for scheduling the Volte service of the edge voice user, and the other means is that, for the same TTI, the Volte service of the edge voice user is scheduled to the dedicated RB resources.
Further, in step 3.1.1, the BLER update timer is started and at the same time the AN counter and BLER value are initialized.
Further, in step 3, the opening of the edge voice dedicated RB function and the location selection of the dedicated RB are both kept in a network-wide unified configuration.
Compared with the prior art, the method has the following remarkable advantages:
the invention optimizes the VoLTE experience of the edge voice users from the scheduling angle of the base station L2, so that the VoLTE service of the edge voice users is carried out more smoothly, the improvement effect can be seen from RSRP reported by UE and downlink transmission BLER values counted by the base station side, or in the environment test process, the edge users (RSRP is less than-95 dBm) are firstly determined, and then the edge users are far away from a far point to observe the actual call effect and BLER values.
The invention improves the performance of the edge voice user by improving the downlink service channel transmitting power of the VoLTE voice user in the edge LTE system and reserving the special RB function of the edge voice, the improvement effect can be seen from RSRP reported by UE and downlink transmission BLER value counted by a base station side, or in the environment test process, the edge user (RSRP is less than-95 dBm) is firstly determined, then the edge user is far away from a remote point, and the actual call effect and the BLER value are observed.
Drawings
Fig. 1 is a flowchart of the overall processing of downlink scheduling according to the method of the present invention;
fig. 2 is a flowchart of the 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 edge users and edge VoLTE voice users;
step 2, the power of the edge Voice users is increased, and the power increase of the edge Voice users is realized in downlink scheduling based on a base station L2;
and 3, scheduling the special RB of the edge Volte voice users, and reserving the special RB resources for scheduling the edge VoLTE voice users by the base station.
Further, in step 1, the method further comprises the following steps:
step 1.1, judging edge users:
step 1.1.1, configuring a base station, and enabling UE to periodically measure RSRP events, wherein the reporting period is configured to 2048 ms;
step 1.1.2, UE accesses a base station, in the accessing process, the base station issues a periodic RSRP measuring event of the UE to the UE through reconfiguration signaling, and after the UE takes effect, the UE periodically reports a Measurement Report containing an RSRP value to the base station;
step 1.1.3, the base station acquires a Measurement Report containing RSRP value in real time;
step 1.1.4, the base station adds an edge UE mark UeEdgeFlag in the UE instance information, if the UeEdgeFlag value is 1, the edge UE is represented, if the UeEdgeFlag value is 0, the non-edge UE is represented, and when the base station equipment is powered on and a program module is loaded, and when software carries out system initialization, the UeEdgeFlag value is reset;
step 1.1.5, the base station analyzes the Measurement Report, acquires the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is less than-95 dBm and the UeEdgeFlag value is 0, the base station L3 notifies 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 notifies the base station L2 to update the UeEdgeFlag value in the UE instance to be 0;
step 1.2, judging the edge Voice subscriber, in the CMAC software module, after the UE accesses the base station, establishing an information list related to the UE, and when the service with QCI level 1 exists, judging the UE as the edge Voice subscriber.
Further, in step 2, the method further comprises the following steps:
step 2.1, the scheduler in the base station selects the UE to be scheduled, determines whether the UE to be scheduled in TTI is an edge Voice user, and calculates the RB to be reserved in TTI which does not need to be scheduled:
step 2.1.1, setting N t of UE selected and scheduled by TTI, wherein the N t of UE belongs to edge Voice users: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely setting the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, Nboost as the number of UE of marginal Voice users capable of improving power of TTI, Nres as the number of RB which does not need to be scheduled in TTI, and selecting UE scheduled in TTI;
step 2.1.3, when Nt is less than or equal to NB/X, the number Nboost of the edge Voice user UE capable of improving power in TTI is the number Nt of the edge Voice user, wherein when the cell bandwidth is set to 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 edge voice user UEs capable of improving power in TTI is the number NB/X of downlink RBs in the cell, where when the cell bandwidth is set to 20M, the value of X is 25, the value of Nboost is 4, and it should be noted that the number of RBs corresponding to the 20M cell bandwidth is 100;
and 2.2, after the L2 CMAC module finishes downlink scheduling, before TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Voice user and the number of the UE for increasing the power of the TTI is less than Nboost, increasing the downlink transmission power of the UE, wherein the downlink transmission power of the UE is increased by 3 db.
Further, in step 3, the method further comprises the following steps:
step 3.1, judging the edge Voice dedicated scheduling UE:
step 3.1.1, starting a BLER updating timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of an edge Volte voice user, and judging whether the BLER value exceeds a threshold Thrld3, wherein the value of Thrld3 is 5%;
step 3.1.2, when the BLER value of the edge Voice user exceeds a threshold Thrld3, marking the user as edge Voice special scheduling UE;
and 3.2, allocating the special RB resources, and in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Voice dedicated scheduling UE is 1 and the number of the scheduled RBs is less than or equal to the number of the remaining reserved RBs, allocating the special RB resources to the PDSCH of the scheduled edge Voice dedicated scheduling UE.
Further, in step 1.1.1, the reporting period configuration further includes 1024ms or 5120 ms.
Further, in step 1.1.5, the base station performs RSRP value analysis and decision on the Measurement Report through 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 voice users per TTI to boost the downlink transmission power.
Further, in step 3, the base station network management software is configured to configure the number of dedicated RBs and the location of dedicated RBs for edge voice dedicated RB scheduling.
Further, in step 3.1.1, the BLER update timer is started and at the same time the AN counter and BLER value are initialized.
Further, in step 3, the opening of the edge voice dedicated RB function and the location selection of the dedicated RB are both kept in a network-wide unified configuration.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and various modifications and changes can be made by those skilled in the art without departing from the spirit and principle of the present invention, and any modifications, equivalents, improvements, etc. should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for improving the call quality of VoLTE voice users at the edge of an LTE system is characterized by comprising the following steps:
step 1, judging edge users and edge VoLTE voice users;
step 2, the power of the edge Voice users is increased, and the power increase of the edge Voice users is realized in downlink scheduling based on a base station L2;
and 3, scheduling the special RB of the edge Volte voice users, and reserving the special RB resources for scheduling the edge VoLTE voice users by the base station.
2. The method for improving the speech quality of the edge VoLTE voice users in the LTE system according to claim 1, further comprising the following steps in step 1:
step 1.1, judging edge users:
step 1.1.1, configuring a base station, and enabling UE to periodically measure RSRP events, wherein the reporting period is configured to 2048 ms;
step 1.1.2, UE accesses a base station, in the accessing process, the base station issues a periodic RSRP measuring event of the UE to the UE through reconfiguration signaling, and after the UE takes effect, the UE periodically reports a Measurement Report containing an RSRP value to the base station;
step 1.1.3, the base station acquires a Measurement Report containing RSRP value in real time;
step 1.1.4, the base station adds an edge UE mark UeEdgeFlag in the UE instance information, if the UeEdgeFlag value is 1, the edge UE is represented, if the UeEdgeFlag value is 0, the non-edge UE is represented, and when the base station equipment is powered on and a program module is loaded, and when software carries out system initialization, the UeEdgeFlag value is reset;
step 1.1.5, the base station analyzes the Measurement Report, acquires the RSRP value therein and judges the edge user;
step 1.1.6, when the RSRP value analyzed by the base station is less than-95 dBm and the UeEdgeFlag value is 0, the base station L3 notifies 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 notifies the base station L2 to update the UeEdgeFlag value in the UE instance to be 0;
step 1.2, judging the edge Voice subscriber, in the CMAC software module, after the UE accesses the base station, establishing an information list related to the UE, and when the service with QCI level 1 exists, judging the UE as the edge Voice subscriber.
3. The method for improving the speech quality of the edge VoLTE voice users in the LTE system according to claim 1, further comprising the following steps in step 2:
step 2.1, the scheduler in the base station selects the UE to be scheduled, determines whether the UE to be scheduled in TTI is an edge Voice user, and calculates the RB to be reserved in TTI which does not need to be scheduled:
step 2.1.1, setting N t of UE selected and scheduled by TTI, wherein the N t of UE belongs to edge Voice users: UE1, UE2, … …, UENt;
step 2.1.2, setting the downlink RB number of the cell as NB, namely setting the downlink RB set as { RB (0), RB (1), … …, RB (NB-1) }, Nboost as the number of UE of marginal Voice users capable of improving power of TTI, Nres as the number of RB which does not need to be scheduled in TTI, and selecting UE scheduled in TTI;
step 2.1.3, when Nt is less than or equal to NB/X, the number Nboost of the edge Voice user UE capable of improving power in TTI is the number Nt of the edge Voice user, wherein when the cell bandwidth is set to 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 edge Volte voice user UE capable of improving power in TTI is the cell downlink RB number NB/X, wherein when the cell bandwidth is set to 20M, the value of X is 25, and the value of Nboost is 4;
and 2.2, after the L2 CMAC module finishes downlink scheduling, before TTI scheduling information is sent to the L1 PHY module, when the UE is an edge Voice user and the number of the UE for increasing the power of the TTI is less than Nboost, increasing the downlink transmission power of the UE, wherein the downlink transmission power of the UE is increased by 3 db.
4. The method for improving the speech quality of the edge VoLTE voice users in the LTE system according to claim 1, further comprising the following steps in step 3:
step 3.1, judging the edge Voice dedicated scheduling UE:
step 3.1.1, starting a BLER updating timer at the initial stage of downlink scheduling of the current UE, periodically updating the BLER value of an edge Volte voice user, and judging whether the BLER value exceeds a threshold Thrld3, wherein the value of Thrld3 is 5%;
step 3.1.2, when the BLER value of the edge Voice user exceeds a threshold Thrld3, marking the user as edge Voice special scheduling UE;
and 3.2, allocating the special RB resources, and in the process of allocating the RB resources by the CMAC module, when the data packet QC1 of the scheduled edge Voice dedicated scheduling UE is 1 and the number of the scheduled RBs is less than or equal to the number of the remaining reserved RBs, allocating the special RB resources to the PDSCH of the scheduled edge Voice dedicated scheduling UE.
5. The method of claim 2, wherein in step 1.1.1, the reporting period configuration further includes 1024ms or 5120 ms.
6. The method for improving the call quality of the edge VoLTE voice user in the LTE system according to claim 2, wherein in step 1.1.5, the base station analyzes and decides the RSRP value of the Measurement Report through L3 layer.
7. The method of claim 3, 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 increase the downlink transmission power.
8. The method for improving the call quality of the edge VoLTE voice users in the LTE system as claimed in claim 4, wherein in step 3, the base station network management software is used to configure the number of the special RBs and the position of the special RBs for edge Volte voice special RB scheduling.
9. The method for improving the speech quality of AN edge VoLTE voice user in AN LTE system as claimed in claim 4, wherein in step 3.1.1, the AN counter and BLER value are initialized while the BLER update timer is started.
10. The method for improving the call quality of the edge VoLTE voice users in the LTE system as claimed in claim 4, wherein in step 3, the opening of the edge VoLTE voice dedicated RB function and the selection of the location of the dedicated RB are all configured uniformly in the whole network.
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| WO2023109331A1 (en) * | 2021-12-16 | 2023-06-22 | 中兴通讯股份有限公司 | Method for improving downlink quality of voice service, and chip, device and storage medium |
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| CN113572736A (en) * | 2021-06-25 | 2021-10-29 | 北京长焜科技有限公司 | Bidirectional merging real-time playing method for VoLTE voice message |
| CN113572736B (en) * | 2021-06-25 | 2023-03-10 | 北京长焜科技有限公司 | Bidirectional merging and real-time playing method for VoLTE voice message |
| WO2023109331A1 (en) * | 2021-12-16 | 2023-06-22 | 中兴通讯股份有限公司 | Method for improving downlink quality of voice service, and chip, device and storage medium |
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