CN105979495B - Method for improving call quality, radio network controller and core network - Google Patents

Method for improving call quality, radio network controller and core network Download PDF

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Publication number
CN105979495B
CN105979495B CN201610502502.3A CN201610502502A CN105979495B CN 105979495 B CN105979495 B CN 105979495B CN 201610502502 A CN201610502502 A CN 201610502502A CN 105979495 B CN105979495 B CN 105979495B
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voice
rnc
core network
voice data
rate
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CN105979495A (en
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王丽
游钦文
李明
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Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Priority to PCT/CN2017/090019 priority patent/WO2018001203A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • 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]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a method for improving the call quality, which is used for improving the call quality in voice call. The method provided by the embodiment of the invention comprises the following steps: when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set; if the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold; and the RNC transcodes the received first voice data and then transmits the transcoded first voice data. The embodiment of the invention also discloses a wireless network controller.

Description

Method for improving call quality, radio network controller and core network
Technical Field
The present invention relates to the field of communications, and in particular, to a method for improving call quality, a radio network controller, and a core network.
Background
A transcoding Free Operation (TrFO) technique is used to solve the two speech encoding/decoding problems in the conventional end-to-end call process. In a conventional UE (User Equipment) -UE call process, speech encoding/decoding is performed twice in an end-to-end process from a calling UE to a called UE. When the calling UE and the called UE both adopt the same Adaptive Multi-Rate (AMR) Rate set, the TrFO technology is applied, and compressed voice frames can be directly transmitted between the calling UE and the called UE, so that the calling UE and the called UE are encoded/decoded only once, the damage to the voice signals caused by repeated encoding and decoding operations in the calling process of the traditional UE-UE is solved, the quality of the voice signals is improved, and a user can obtain better conversation feeling.
The TrFO technology requires that the voice rates of the UEs at the home terminal and the opposite terminal are consistent, so as to avoid introducing the single-pass problem. In the prior art, when the UE is in a low signal-to-noise ratio environment, it needs to be reconfigured to a low rate to obtain a better voice quality experience and a lower probability of call drop. Therefore, the TrFO-based speed regulation needs the home terminal UE and the peer terminal UE to perform together, but the completion of the process needs about hundred milliseconds, and when the peer terminal fails in speed regulation, the home terminal UE cannot adopt a rate matched with a wireless environment, so that a better voice quality experience cannot be obtained in a low signal-to-noise ratio environment.
Disclosure of Invention
The embodiment of the invention provides a method for improving call quality, a wireless network controller and a core network, which are used for improving the quality of voice call of a user.
The technical scheme of the invention is applied to a voice communication system and can comprise User Equipment (UE), a Radio Network Controller (RNC) and a Core Network (CN). A first aspect of the embodiment of the invention provides a method for improving the communication quality, which can comprise the following steps: when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set; if the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold; and the RNC transcodes the received first voice data and then transmits the transcoded first voice data.
In the embodiment of the invention, when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set; if the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold, and the RNC transcodes and transmits the received first voice data; RNC can directly configure the speech rate of UE, and one-time air interface radio bearer reconfiguration process is omitted, so that the call drop probability of the user is reduced, and the speech quality of the user call is improved.
With reference to the first aspect of the embodiment of the present invention, in a first possible implementation manner of the first aspect of the embodiment of the present invention, the method may further include: the RNC sends a speed regulation request to the core network, and the speed regulation request is used for regulating the voice rate of the core network to be the voice rate of the UE.
In the embodiment of the present invention, after configuring the voice rate for the UE, the radio network controller may further send a speed adjustment request to the core network, so as to adjust the voice rate of the core network to be consistent with the voice rate of the user equipment.
With reference to the first aspect of the present embodiment, the first possible implementation manner of the first aspect of the present embodiment, and in a second possible implementation manner of the first aspect of the present embodiment, the transcoding, by the RNC, the transmitting the received first voice data may include: the RNC receives downlink voice data sent by the core network; the RNC transcodes the downlink voice data, and the voice rate of the transcoded downlink voice data is the same as the voice rate of the UE; and the RNC transmits the transcoded downlink voice data to the UE.
In the embodiment of the invention, the RNC transcodes and transmits the received first voice data, and refines the transcoding and transmitting process, and provides a feasible scheme for the embodiment of the invention.
With reference to the first aspect of the embodiment of the present invention, the first possible implementation manner of the first aspect of the embodiment of the present invention, in a third possible implementation manner of the first aspect of the embodiment of the present invention, the transcoding, by the RNC, the transmission of the received first voice data may include: the RNC receives uplink voice data sent by the UE; the RNC transcodes the uplink voice data, and the voice rate of the transcoded uplink voice data is the same as the voice rate of the core network; and the RNC transmits the transcoded uplink voice data to the core network.
In the embodiment of the invention, the RNC transcodes and transmits the received first voice data, and details the processes of receiving, transcoding and transmitting are provided, so that another feasible scheme is provided for the embodiment of the invention.
With reference to the first aspect of the embodiment of the present invention, the first possible implementation manner to the third possible implementation manner of the first aspect of the embodiment of the present invention, in a fourth possible implementation manner of the first aspect of the embodiment of the present invention, the method may further include: the RNC receives the speed regulation success information sent by the core network; the RNC transmits the received second voice data.
In the embodiment of the invention, after the core network successfully regulates the speed, the information of successful speed regulation is sent to the RNC, and after the RNC receives the information, the received voice data does not need transcoding and can be directly transmitted, thereby saving certain time and network resources.
With reference to the first aspect of the embodiment of the present invention, in a fifth possible implementation manner of the first aspect of the embodiment of the present invention, the method may further include: the RNC receives speed regulation failure information sent by the core network; and the RNC transcodes the received third voice data and then transmits the transcoded third voice data.
In the embodiment of the invention, when the speed regulation of the core network fails, the speed regulation failure information is sent to the RNC, and after the RNC receives the information, the received voice data is transcoded and then can be transmitted.
A second aspect of the embodiments of the present invention provides a method for improving call quality, which may include: when the signal quality is less than a first preset threshold value, the core network sends a radio access bearer RAB assignment message to a Radio Network Controller (RNC), wherein the RAB assignment message comprises a voice rate set; the core network receives a speed regulation request sent by the RNC; the core network adjusts the voice rate of the core network according to the speed regulation request; if the core network successfully adjusts the voice rate of the core network to the voice rate of the UE, the core network sends a speed regulation success message to the RNC.
In the embodiment of the invention, when the signal quality is less than a first preset threshold value, a core network sends a radio access bearer RAB assignment message to a radio network controller RNC, wherein the RAB assignment message comprises a voice rate set; the core network receives a speed regulation request sent by the RNC; if the core network successfully adjusts the voice rate of the core network to the voice rate of the UE according to the speed regulation request, the core network sends speed regulation success information to the RNC. When the speed regulation is successful, the UE, the RNC and the core network keep the same voice rate, and the transmitted voice data can be directly transmitted without transcoding.
With reference to the second aspect of the embodiment of the present invention, in a first possible implementation manner of the second aspect of the embodiment of the present invention, the method further includes: if the core network fails to adjust the voice rate of the core network, the core network sends speed-adjusting failure information to the RNC.
In the embodiment of the invention, after the core network fails to regulate the speed, the speed regulation failure information is sent to the RNC, the RNC is informed, and the voice data is received or the transcoding and the transmission are carried out.
A third aspect of embodiments of the present invention provides a radio network controller, which has a function of implementing the method for improving call quality provided in correspondence with the first aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
A fourth aspect of the embodiments of the present invention provides a core network having a function of implementing the method for improving call quality provided in correspondence with the second aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
A fifth aspect of an embodiment of the present invention provides a radio network controller, which may include: the transceiver and the processor are connected through a bus;
the transceiver is used for receiving a Radio Access Bearer (RAB) assignment message sent by a core network when the signal quality is less than a first preset threshold, wherein the RAB assignment message comprises a voice rate set;
the processor is configured to configure, for the UE, a voice rate that is less than or equal to a second preset threshold if a highest voice rate in the voice rate set is greater than the second preset threshold; and transcoding the received first voice data and then transmitting the transcoded first voice data.
A sixth aspect of an embodiment of the present invention provides a core network, which may include: the transceiver and the processor are connected through a bus;
the transceiver is used for receiving a speed regulation request sent by the RNC; if the core network successfully adjusts the voice rate of the core network to be the voice rate of the UE, the core network sends speed regulation success information to the RNC;
the processor is used for adjusting the voice rate of the core network according to the speed regulation request.
It should be noted that, in essence, or a part of or all or part of the technical solution contributing to the prior art, the computer software product is stored in a storage medium, and is used for storing computer software instructions for the apparatus, which include a program designed for executing the apparatus according to the first aspect, the second aspect, the third aspect, or the fourth aspect.
The storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the embodiment of the invention, when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set; if the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold, and the RNC transcodes and transmits the received first voice data; RNC can directly configure the speech rate of UE, and one-time air interface radio bearer reconfiguration process is omitted, so that the call drop probability of the user is reduced, and the speech quality of the user call is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the embodiments and the drawings used in the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a diagram illustrating a relationship between a dropped call rate and a signal-to-noise ratio of a circuit service according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a relationship between mean opinion and signal-to-noise ratio of circuit services according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between a block error rate and a signal-to-noise ratio according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the transcoding-free operation of the embodiment of the present invention;
FIG. 5 is a flow chart illustrating speed adjustment based on transcoding-free operation according to an embodiment of the present invention;
FIG. 6a is a schematic flow chart of adaptive multi-rate control technique based speed regulation in an embodiment of the present invention;
FIG. 6b is another schematic flow chart illustrating adaptive multi-rate control based speed adjustment in an embodiment of the present invention;
fig. 7 is a schematic diagram of an embodiment of a method for improving call quality in an embodiment of the present invention;
fig. 8 is a schematic diagram of another embodiment of a method for improving call quality in an embodiment of the present invention;
fig. 9 is a schematic diagram of an embodiment of a rnc in accordance with the present invention;
fig. 10 is a schematic diagram of another embodiment of a rnc in accordance with the present invention;
fig. 11 is a schematic diagram of another embodiment of a rnc in accordance with the present invention;
fig. 12 is a schematic diagram of another embodiment of a rnc in accordance with the present invention;
fig. 13 is a schematic diagram of an embodiment of a core network according to the present invention;
fig. 14 is a schematic diagram of another embodiment of a radio network controller according to the embodiment of the present invention;
fig. 15 is a schematic diagram of another embodiment of a core network in the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for improving call quality and a wireless network controller, which are used for improving the quality of voice call of a user.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, the TrFO technology reduces the damage to voice signals caused by repeated coding and decoding operations in the traditional UE-UE end-to-end calling process, improves the quality of the voice signals, and enables users to obtain better conversation experience. The TrFO technology requires that the voice rates of the UEs at the home terminal and the opposite terminal are consistent, so as to avoid introducing the single-pass problem. An Adaptive Multi-Rate Control (AMRC) technology refers to a Radio Network Controller (RNC) or a UE dynamically selecting a Rate in an AMR call set according to a change of a Radio environment.
As shown in fig. 1, the lower the signal-to-noise ratio, the higher the probability of dropped calls for CS traffic, when viewed in combination with the simulation data and the actual data of the commercial network. As shown in fig. 2, the MOS (mean opinion score) score at low speed is higher under low signal-to-noise ratio conditions. Therefore, when the UE is in a low signal-to-noise environment (i.e. so-called weak coverage), it is recommended to use a lower voice rate to obtain a better voice quality experience; meanwhile, as shown in fig. 3, the low-speed AMR speech can use a smaller codeword to obtain 1-2 dB downlink coverage gain, thereby obtaining a lower dropped call probability.
The principle of the prior art is shown in fig. 4. Fig. 5 shows a flow diagram based on TrFO speed adjustment, when a Radio Network Controller (RNC) at an opposite end receives an AMR rate adjustment request of an RNC at a home end; transmitting a Transport Format Combination (TFC) adjustment message to the UE of the opposite end; if the speed regulation response of the RNC of the opposite terminal does not receive a TFC adjustment failure message sent by the UE of the opposite terminal within the waiting timer time, the speed regulation is successful; and sending a rate adjustment confirmation message to the RNC of the local terminal. When the rate adjustment of the UE at the opposite end fails, the UE cannot adopt the voice rate matched with the wireless network, so that better voice quality experience cannot be obtained in a low signal-to-noise ratio environment. It is also possible that, in the speed adjustment process, due to the wireless environment or the UE, no TFC speed adjustment failure message is received within the waiting timer for the speed adjustment response, which may cause that the UE at the home terminal and the UE at the opposite terminal cannot simultaneously adjust the speed and introduce a single-pass problem.
The AMRC technique throttling signaling flow is shown in fig. 6a and 6 b. When the channel is in a low signal-to-noise ratio environment, even if the speed is successfully regulated through the Rate CONTROL message, the better downlink coverage gain cannot be obtained because the downlink channel code word is not changed. The downlink can be configured to a smaller channel codeword through a Radio Bearer (RB) reconfiguration process, for example, from AMR12.2kbps (downlink using SF128) to AMR5.9/4.75kbps (downlink using SF256), so that a coverage gain of 1-2 dB can be obtained. When a user accesses in a low signal-to-noise ratio environment, according to CN configuration, the narrow-band AMR generally establishes AMR12.2kbps first, and then reconfigures to a low rate of 5.9/4.75kbps, then an RB reconfiguration flow is carried out after the access, but the air interface flow fails or the user soft switching is not timely because of the flow, and the call drop of the user can be caused.
In the technical scheme of the invention, when speed regulation fails, the RNC of the local terminal can also directly configure the UE of the local terminal with the voice rate suitable for the UE of the local terminal, and the RNC of the opposite terminal can also configure the UE of the opposite terminal with the voice rate suitable for the UE of the opposite terminal, and the configured voice rate of the UE of the opposite terminal and the voice rate of the local terminal are kept the same, so that the voice rates of the UE of the local terminal and the UE of the opposite terminal are kept consistent, and the problem of introducing single pass is avoided. The invention provides a method for improving the voice quality experience and the call drop probability of a weak coverage (low signal-to-noise ratio) scene, and an RNC replaces a CN to perform the functions of voice encoding Encoder and decoding Decoder, so that the RNC does not need to negotiate with the CN speed rate and can directly establish/reconfigure a lower voice speed rate for UE.
The following describes the technical solution of the present invention in an embodiment, and as shown in fig. 7, the method for improving call quality in the embodiment of the present invention includes:
701. when the signal quality is less than a first preset threshold value, the core network sends a Radio Access Bearer (RAB) assignment message to the RNC, wherein the RAB assignment message comprises a voice rate set;
step 701 may include steps a and b:
a. when the signal quality is less than a first preset threshold value, the core network sends a radio access bearer RAB assignment message to a Radio Network Controller (RNC), wherein the RAB assignment message comprises a voice rate set;
in the embodiment of the invention, when the signal quality is less than a first preset threshold value, the core network sends a radio access bearer RAB assignment message to the radio network controller RNC, wherein the RAB assignment message comprises a voice rate set. The signal quality is less than a first preset threshold, that is, the UE is in a weak coverage scenario or in an environment with a low signal-to-noise ratio, where the first preset threshold is an empirical value and may be adjusted accordingly according to practical applications. A brief description of several scenarios for determining signal quality is provided below, as follows:
idle state access: determining whether a signal quality (Measured results on RACH) carried in an RRC CONNECTION REQUEST (RRC CONNECTION REQUEST) message is less than a first preset threshold;
CELL-DCH (CELL Dedicated Channel) state access: determining whether the signal quality in a measurement report reported by an event/period is less than a first preset threshold value;
CELL Forward Access channel (CELL Forward Access channel) state access: determining INITIAL DIRECT TRANSFER/UPLINK DIRECT TRANSFER (initial direct transmission/UPLINK direct transmission) whether a signal quality (Measured results on RACH) carried in the message is less than a first preset threshold;
URA (system) -PCH/CELL-PCH (Paging Channel) state access: it is determined whether the signal quality carried in the CELL UPDATE message is less than a first preset threshold.
It should be noted that, the determination of whether the signal quality is less than the first preset threshold may include, but is not limited to, the above-mentioned manners. A so-called weak coverage environment is a range where the signal strength (RSSI) is below the usable value. The mobile defined weak coverage is RSSI < -75dBm, and the telecom is defined as RSSI < -65 dBm. Or, the weak coverage is that the coverage area required by the base station is large, the base station spacing is too large, or the boundary area signal is weak due to building occlusion. The weak coverage is generally less than-90 dBm at Rxlev (Received Signal Level). It should be understood that signal quality herein includes, but is not limited to, being indicated by parameters such as channel quality, signal-to-noise ratio, and quality of service.
Here, the RAB assignment message includes a speech rate set, which may be a wideband speech rate set or a narrowband speech rate set. Illustratively, when a user accesses in a low signal-to-noise ratio environment, the voice rate set is assumed to be a narrowband AMR set, which is {12.2kbps } (the downlink uses SF128), according to the configuration of the core network. It should be noted that the speech rate set is not equal to the empty set, and includes at least one speech rate, which is not limited specifically.
b. When the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set;
in the embodiment of the invention, when the signal quality is less than a first preset threshold value, the radio network controller RNC receives a radio access bearer RAB assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set. The speech rate set here may be a wideband speech rate set or a narrowband speech rate set.
Illustratively, the RNC receives an RAB assignment message that includes a set of speech rates, which may be a narrowband AMR set, of {12.2kbps }.
702. If the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold;
in the embodiment of the invention, after the radio access bearer RAB assignment message sent by the core network is received by the RNC, if the highest voice rate in the voice rate set is greater than a second preset threshold value after the RAB assignment message comprises the voice rate set, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold value.
It should be noted that if the RAB assignment message includes different types of speech rate sets, the corresponding second preset threshold is also different. It is assumed that if the RAB assignment message includes a set of narrowband speech rates, then the second preset threshold may be 5.9kbps or 4.75kbps (using SF256 downstream); if the RAB assignment message includes a set of wideband speech rates, then the second preset threshold may be 6.6 kbps.
Illustratively, in step 703, the narrowband AMR set is {12.2kbps }, and is greater than 5.9kbps, so the voice rate configured for the UE by the RNC at the UU port is less than or equal to 5.9kbps, and in general, the voice rate configured for the UE is 5.9kbps, but it is not limited specifically here. The lower the speech rate configured for the UE is theoretically the better, because the average opinion score obtained according to the low speech rate is higher in the graph shown in fig. 2.
703. The RNC transcodes the received first voice data and then transmits the transcoded first voice data;
in the embodiment of the invention, the RNC transcodes and transmits the received first voice data; specifically, the method can comprise the following steps:
(1) RNC receives downlink voice data sent by a core network; the RNC transcodes the downlink voice data, and the voice rate of the transcoded downlink voice data is the same as that of the UE; the RNC transmits the transcoded downlink voice data to the UE;
or,
(2) RNC receives uplink voice data sent by UE; the RNC transcodes the uplink voice data, the RNC transcodes the uplink voice data sent by the receiving UE, and the voice rate of the transcoded uplink voice data is the same as that of the core network; and the RNC transmits the transcoded uplink voice data to a core network.
It should be noted that the transcoding herein includes encoding/decoding, and in the process, both the encoding and decoding processes exist.
Exemplarily, (1) it is assumed that, here, the RNC receives downlink voice data transmitted by the core network; the voice rate of the core network is 12.2kbps, but the voice rate of the UE is 5.9kbps, then the RNC needs to transcode the downlink voice data, and transcode the data from 12.2kbps to 5.9kbps, so that the RNC transmits the transcoded 5.9kbps to the UE, and the UE can recognize the voice data of 5.9kbps, thereby completing the data communication.
(2) Suppose that the RNC receives uplink voice data sent by the UE; the voice rate of the UE is 5.9kbps, and the voice rate of the core network is 12.2kbps, so the RNC needs to transcode the uplink voice data, and transcode the uplink voice data from 5.9kbps to 12.2kbps, so the RNC transmits the transcoded 12.2kbps to the core network, and the core network can recognize the voice data of 12.2kbps, thereby completing the data communication.
It should be noted that the foregoing example describes the speech rate in a narrow band, and the speech rate in a wide band is the same, and the description thereof is omitted here.
704. The RNC sends a speed regulation request to a core network;
in an embodiment of the present invention, step 704 may include steps c and d:
c. the RNC sends a speed regulation request to the core network, and the speed regulation request is used for regulating the voice rate of the core network to be the voice rate of the UE;
in the embodiment of the present invention, the RNC sends a speed Control request (Rate Control) to the core network, which is used to adjust the voice Rate of the core network to the voice Rate of the UE. It should be noted that, when the TrFO function is turned on, a speed regulation request needs to be initiated to the core network.
d. A core network receives a speed regulation request sent by an RNC;
in the embodiment of the invention, after the RNC sends the speed regulation request to the core network, the core network receives the speed regulation request sent by the RNC.
705. The core network adjusts the voice rate of the core network according to the speed regulation request;
in the embodiment of the invention, after receiving the speed regulation request sent by the RNC, the core network CN adjusts the voice rate of the core network according to the speed regulation request.
706. If the core network successfully adjusts the voice rate of the core network to be the voice rate of the UE, the core network sends the speed-adjusting success information to the RNC;
in an embodiment of the present invention, step 706 may include steps e and f:
e. if the core network successfully adjusts the voice rate of the core network to be the voice rate of the UE, the core network sends speed regulation success information to the RNC;
in the embodiment of the invention, if the core network successfully adjusts the voice rate of the core network to be the voice rate of the UE according to the speed regulation request, the core network sends the speed regulation success information to the RNC.
Illustratively, the IU port of the core network supports the speed regulation request sent by the RNC, and the speed regulation request includes the voice rate of the UE, so the core network adjusts its own voice rate to the voice rate supported by the UE. That is, the core network adjusts the speech rate from 12.2kbps to 5.9kbps, and then transmits the pacing success information to the RNC.
f. RNC receives the speed regulation success information sent by the core network;
in the embodiment of the invention, after the core network sends the speed regulation success information to the RNC, the RNC receives the speed regulation success information sent by the core network.
707. And the RNC transmits the received second voice data.
In the embodiment of the invention, the RNC transmits the received second voice data. Can include the following steps: and the RNC receives the voice data sent by the core network and directly sends the voice data to the UE. Or, the RNC receives the voice data sent by the UE and directly sends the voice data to the core network. The transcoding operation is not needed because the voice rates of the UE, RNC and core network are kept consistent through the above steps.
It should be noted that step 704-707 is an optional step, and in practical applications, whether the step needs to be executed or not may be determined according to specific requirements.
In the embodiment of the invention, under a weak coverage environment, the RNC receives a voice rate set sent by a core network, and when the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by RNC User Equipment (UE) is less than or equal to the second preset threshold. Taking narrowband voice as an example, the RNC can directly establish the AMR rate of 5.9kbps (downlink adopts SF256 code word) for the UE, and can obtain 1-2 dB coverage gain compared with directly establishing AMR12.2kbps, thereby obtaining better voice quality experience and lower call drop probability. Furthermore, the RNC can also send a speed regulation request to the CN, so that the voice rates of the UE, the RNC and the CN are kept consistent and are low voice rates of the UE, the signal quality of conversation is ensured, and transcoding is not needed when voice data are transmitted through the RNC, so that time and network resources are saved.
As shown in fig. 8, a schematic diagram of another embodiment of the method for improving call quality in the embodiment of the present invention includes:
801. when the signal quality is less than a first preset threshold value, the core network sends a Radio Access Bearer (RAB) assignment message to the RNC, wherein the RAB assignment message comprises a voice rate set;
step 801 may include steps a and b:
a. when the signal quality is less than a first preset threshold value, the core network sends a radio access bearer RAB assignment message to a Radio Network Controller (RNC), wherein the RAB assignment message comprises a voice rate set;
b. when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set.
802. If the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold;
803. the RNC transcodes the received first voice data and then transmits the transcoded first voice data;
804. the RNC sends a speed regulation request to a core network;
step 804 may include steps c and d:
c. and the RNC sends a speed regulation request to the core network, and is used for regulating the voice rate of the core network to be the voice rate of the UE.
d. A core network receives a speed regulation request sent by an RNC;
in the embodiment of the present invention, the steps 801-804 are the same as the steps 701-704 shown in fig. 7, and are not described herein again.
805. The core network adjusts the voice rate of the core network according to the speed regulation request;
806. if the core network fails to adjust the voice rate of the core network, the core network sends speed-adjusting failure information to the RNC;
step 806 may include steps e and f:
e. if the core network fails to adjust the voice rate of the core network according to the speed-adjusting request, the core network sends speed-adjusting failure information to the RNC.
In the embodiment of the invention, if the core network fails to adjust the voice rate of the core network according to the speed regulation request, the core network sends speed regulation failure information to the RNC.
Illustratively, the IU port of the core network does not support the speed regulation request sent by the RNC, and the speed regulation request includes the voice rate of the UE, so the core network cannot adjust its own voice rate to the voice rate supported by the UE. The pacing failure information is sent to the RNC.
f. RNC receives speed regulation failure information sent by a core network;
in the embodiment of the invention, after the core network sends the speed regulation failure information to the RNC, the RNC receives the speed regulation failure information sent by the core network.
807. And the RNC transcodes the received third voice data and then transmits the transcoded third voice data.
In the embodiment of the invention, the RNC transcodes the received third voice data and then transmits the transcoded third voice data. Can include the following steps: and the RNC receives the voice data sent by the core network, transcodes the voice data and then sends the transcoded voice data to the UE. Or the RNC receives the voice data sent by the UE, transcodes the voice data and then sends the transcoded voice data to the core network.
Illustratively, since the rate adjustment of the core network fails, the voice rate sent by the core network is still 12.2kbps before, and the voice rate of the UE is 5.9kbps, so the RNC is required to transcode the received voice data before transmitting the data. It should be noted that after receiving the speed regulation failure information sent by the core network, the RNC may further continue to send a speed regulation request to the core network, and the specific step of successful speed regulation may refer to step 704 and 707 in fig. 7.
In the embodiment of the invention, under a weak coverage environment, the RNC receives a voice rate set sent by a core network, and when the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by RNC User Equipment (UE) is less than or equal to the second preset threshold. Therefore, the RNC can directly configure the low voice rate for the UE, and the voice rate of the UE can be reduced without establishing the same voice rate with the CN by the RNC. Taking narrowband voice as an example, compared with the prior art that Radio Bearer (RB) reconfiguration is performed after amr12.2kbps access and then to a lower rate, an empty RB reconfiguration procedure is omitted once, thereby reducing the call drop probability of a user. Because when the RB reconfiguration process fails or the soft handover introduced by the RB reconfiguration process is not timely, the call drop of the user can occur; thereby improving the speech communication quality.
The above description of the method for improving call quality in the embodiment of the present invention, and the following description of the radio network controller in the embodiment of the present invention, as shown in fig. 9, are a schematic diagram of an embodiment of the radio network controller in the embodiment of the present invention, and include:
a receiving module 901, configured to receive, when the signal quality is less than a first preset threshold, an RAB assignment message sent by a core network, where the RAB assignment message includes a voice rate set;
a configuration module 902, configured to, if a highest voice rate in the voice rate set is greater than a second preset threshold, configure, by the configuration module, the voice rate configured for the user equipment UE to be less than or equal to the second preset threshold;
and a transmission module 903, configured to transcode and transmit the received first voice data.
Optionally, in some embodiments of the present invention, on the basis shown in fig. 9, as shown in fig. 10, the radio network controller further includes:
a sending module 904, configured to send a speed adjustment request to the core network, configured to adjust a voice rate of the core network to a voice rate of the UE.
Optionally, in some embodiments of the present invention, on the basis shown in fig. 9 or fig. 10, as shown in fig. 11 or fig. 12, the transmission module 903 includes:
a receiving unit 9031, configured to receive downlink voice data sent by a core network;
a transcoding unit 9032, configured to transcode the downlink voice data, where a voice rate of the transcoded downlink voice data is the same as a voice rate of the UE;
a transmission unit 9033, configured to transmit the transcoded downlink voice data to the UE.
Alternatively, in some embodiments of the present invention,
a receiving unit 9031, further configured to receive uplink voice data sent by the UE;
the transcoding unit 9032 is further configured to transcode the uplink voice data, where a voice rate of the transcoded uplink voice data is the same as a voice rate of the core network;
the transmission unit 9033 is further configured to transmit the transcoded uplink voice data to a core network.
Alternatively, in some embodiments of the present invention,
the receiving module 901 is further configured to receive the speed regulation success information sent by the core network;
the transmission module 903 is further configured to transmit the received second voice data.
Alternatively, in some embodiments of the present invention,
the receiving module 901 is further configured to receive speed regulation failure information sent by a core network;
the transmission module 903 is further configured to transcode and transmit the received third voice data.
As shown in fig. 13, which is a schematic diagram of an embodiment of a core network in the embodiment of the present invention, the core network includes:
a sending module 1301, configured to send a radio access bearer RAB assignment message to a radio network controller RNC when the signal quality is less than a first preset threshold, where the RAB assignment message includes a voice rate set;
a receiving module 1302, configured to receive a speed adjustment request sent by an RNC;
an adjusting module 1303, configured to adjust a voice rate of the core network according to the speed regulation request;
the sending module 1301 is further configured to send the speed regulation success information to the RNC if the core network successfully adjusts the voice rate of the core network to the voice rate of the UE.
Alternatively, in some embodiments of the present invention,
the sending module 1301 is further configured to send speed regulation failure information to the RNC if the core network fails to regulate the voice rate of the core network.
As shown in fig. 14, which is a schematic diagram of another embodiment of a radio network controller in an embodiment of the present invention, including:
the rnc, which may vary widely in configuration or performance, may include a transceiver 1401, one or more Central Processing Units (CPUs) 1402 (e.g., one or more processors) and memory 1403, one or more storage media 1404 (e.g., one or more mass storage devices) that store applications 14041 or data 14042. Wherein memory 1403 and storage medium 1404 may be transient storage or persistent storage. The program stored on the storage medium 1404 may include one or more modules (not shown in fig. 14), each of which may include a sequence of instructions for operating on the radio network controller. Still further, central processor 1402 may be configured to communicate with storage medium 1404 to perform a series of instruction operations in storage medium 1404 on a radio network controller.
In this embodiment of the present invention, the transceiver 1401 is configured to receive, when the signal quality is less than a first preset threshold, an RAB assignment message of a radio access bearer sent by a core network, where the RAB assignment message includes a voice rate set;
a processor 1402, configured to, if a highest voice rate in the voice rate set is greater than a second preset threshold, configure, by the processor, the voice rate for the user equipment UE to be less than or equal to the second preset threshold; and transcoding the received first voice data and then transmitting the transcoded first voice data.
Alternatively, in some embodiments of the present invention,
a transceiver 1401, further adapted to perform steps c and f in the above-described method embodiment shown in fig. 7 or steps c and f in the method embodiment shown in fig. 8;
the processor 1402 is further configured to perform step 707 in the method embodiment shown in fig. 7 or step 807 in the method embodiment shown in fig. 8.
Alternatively, in some embodiments of the present invention,
a processor 1402, specifically configured to receive downlink voice data sent by a core network; transcoding the downlink voice data, wherein the voice rate of the transcoded downlink voice data is the same as that of the UE; and transmitting the transcoded downlink voice data to the UE.
Alternatively, in some embodiments of the present invention,
the processor 1402 is further specifically configured to receive uplink voice data sent by the UE; transcoding the uplink voice data, wherein the voice rate of the transcoded uplink voice data is the same as that of the core network; and transmitting the transcoded uplink voice data to a core network.
As shown in fig. 15, a schematic diagram of another embodiment of a core network in the embodiment of the present invention includes:
the core network may vary widely in configuration or performance and may include a transceiver 1501, one or more Central Processing Units (CPUs) 1502 (e.g., one or more processors) and memory 1503, one or more storage media 1504 (e.g., one or more mass storage devices) storing applications 15041 or data 15042. Memory 1503 and storage medium 1504 may be transient storage or persistent storage, among others. The program stored on the storage medium 1504 may include one or more modules (not shown in fig. 15), each of which may include a sequence of instructions operating on a core network. Further, the central processor 1502 may be configured to communicate with the storage medium 1504 to execute a series of instruction operations in the storage medium 1504 over a core network.
In this embodiment of the present invention, the transceiver 1501 is configured to send a radio access bearer RAB assignment message to the radio network controller RNC when the signal quality is less than a first preset threshold, where the RAB assignment message includes a voice rate set; receiving a speed regulation request sent by an RNC; and if the core network successfully adjusts the voice rate of the core network to be the voice rate of the UE, the transceiver sends speed-adjusting success information to the RNC.
The processor 1502 is configured to adjust a voice rate of the core network based on the speed adjustment request.
Optionally, in some embodiments of the present invention, the transceiver 1501 is further configured to send a speed regulation failure message to the RNC if the core network fails to regulate the voice rate of the core network.
An embodiment of the present invention further provides a computer program product for data processing, which includes a computer-readable storage medium storing program code, where the program code includes instructions for executing the method flow described in any of the foregoing method embodiments. It will be understood by those of ordinary skill in the art that the foregoing storage media include: various non-transitory machine-readable media that can store program code include, but are not limited to, U.S. disks, removable disks, magnetic disks, optical disks, Random-Access memories (RAMs), Solid-State disks (SSDs), or other non-volatile memories (non-volatile memories).
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A method for improving call quality, comprising:
when the signal quality is less than a first preset threshold value, a Radio Network Controller (RNC) receives a Radio Access Bearer (RAB) assignment message sent by a core network, wherein the RAB assignment message comprises a voice rate set;
if the highest voice rate in the voice rate set is greater than a second preset threshold, the voice rate configured by the RNC for the user equipment UE is less than or equal to the second preset threshold;
the RNC transcodes and transmits the received first voice data;
the RNC carries out transcoding transmission on the received first voice data and comprises the following steps:
the RNC receives downlink voice data sent by the core network; the RNC transcodes the downlink voice data, and the voice rate of the transcoded downlink voice data is the same as that of the UE; the RNC transmits the transcoded downlink voice data to the UE;
or,
the RNC receives uplink voice data sent by the UE; the RNC transcodes the uplink voice data, and the voice rate of the transcoded uplink voice data is the same as the voice rate of the core network; and the RNC transmits the transcoded uplink voice data to the core network.
2. The method of claim 1, further comprising:
and the RNC sends a speed regulation request to the core network, and is used for regulating the voice rate of the core network to be the voice rate of the UE.
3. The method of any of claims 1-2, further comprising:
the RNC receives the speed regulation success information sent by the core network;
and the RNC transmits the received second voice data.
4. The method according to any one of claims 1-2, further comprising:
the RNC receives speed regulation failure information sent by the core network;
and the RNC transcodes the received third voice data and then transmits the transcoded third voice data.
5. A radio network controller, comprising:
the receiving module is used for receiving a Radio Access Bearer (RAB) assignment message sent by a core network when the signal quality is less than a first preset threshold, wherein the RAB assignment message comprises a voice rate set;
a configuration module, configured to configure, by the configuration module, the voice rate for the UE to be less than or equal to a second preset threshold if a highest voice rate in the voice rate set is greater than the second preset threshold;
the transmission module is used for transcoding and transmitting the received first voice data;
the transmission module includes:
a receiving unit, configured to receive downlink voice data sent by the core network;
the transcoding unit is used for transcoding the downlink voice data, and the voice rate of the transcoded downlink voice data is the same as the voice rate of the UE;
the transmission unit is used for transmitting the transcoded downlink voice data to the UE;
or, the receiving unit is further configured to receive uplink voice data sent by the UE;
the transcoding unit is further configured to transcode the uplink voice data, and a voice rate of the transcoded uplink voice data is the same as a voice rate of the core network;
and the transmission unit is also used for transmitting the transcoded uplink voice data to the core network.
6. The rnc of claim 5, further comprising:
and the sending module is used for sending a speed regulation request to the core network and regulating the voice rate of the core network to be the voice rate of the UE.
7. The radio network controller according to any of claims 5-6,
the receiving module is further configured to receive the speed regulation success information sent by the core network;
the transmission module is further configured to transmit the received second voice data.
8. The radio network controller according to any of claims 5-6,
the receiving module is further configured to receive speed regulation failure information sent by the core network;
and the transmission module is also used for transcoding and transmitting the received third voice data.
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