CN112291037A - Apparatus and method for performing codec rate adaptation in wireless communication system - Google Patents
Apparatus and method for performing codec rate adaptation in wireless communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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Abstract
An apparatus and method for performing codec rate adaptation in a wireless communication system. The invention discloses a communication device for executing coding and decoding rate adjustment, which comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute instructions stored in the memory device. The instructions include receiving a first bit rate recommendation from a first cell; selecting a first codec rate and encoding the first plurality of packets; receiving a handover command for setting the communication device to handover to a second cell from the first cell; performing a handover to the second cell; transmitting a bit rate query to the second cell; receiving a second bit rate recommendation from the second cell; and selecting a second codec rate and encoding the second plurality of packets.
Description
The divisional application is filed on 2017, 9 and 30, and has an application number of 201710938387.9, and is named as a device and a method for performing codec rate adaptation in a wireless communication system.
Technical Field
The present invention relates to an apparatus and method for a wireless communication system, and more particularly, to an apparatus and method for performing codec rate adaptation.
Background
Voice and Video over LTE (VoLTE/ViLTE) provides a key feature of Voice and Video services for long-term evolution (LTE) systems. In the case where the 3GPP agrees to use codec rate adaptation during an on-going call (on-going call) through codec mode/rate selection and adaptation (adaptation) in voice and video over long term evolution, a radio access network assisted solution is advantageous and feasible from a Radio Access Network (RAN) perspective.
Disclosure of Invention
The present invention provides a communication device and method for performing codec rate adaptation (codec rate adaptation) to solve the above-mentioned problems.
The invention discloses a communication device for executing a codec rate adaptation (codec rate adaptation), comprising a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute instructions stored in the memory device. The command includes receiving a first bit rate recommendation (bit rate recommendation) from a first cell; selecting a first codec rate (codec rate) according to the first bit rate recommendation, and encoding (encode) a first plurality of packets (packets) according to the first codec rate; receiving a handover command (handover command) from the first cell to set the communication device to handover (handover over) to a second cell; performing a handover (handover) to the second cell in response to the handover command; transmitting a bit rate query (bit rate query) to the second cell after performing the handover; receiving a second bit rate recommendation from the second cell, wherein the second cell transmits the second bit rate recommendation in response to the bit rate query; and selecting a second codec rate according to the second bit rate recommendation, and encoding a second plurality of packets according to the second codec rate.
The present invention further discloses a communication device for performing codec rate adaptation, comprising a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute instructions stored in the memory device. The command includes transmitting a bit rate query to a cell of a Base Station (BS); and retransmitting the bit rate query to the cell when a response is not received in response to the bit rate query for a time period (time period).
The present invention further discloses a communication device for performing codec rate adaptation, comprising a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute instructions stored in the memory device. The command includes a first transmission of a first Medium Access Control (MAC) Control Element (CE) and a second transmission of a data for triggering (trigger) a bit rate query or a delay budget reporting (delay budget reporting); making a first determination (determination) that a transmission priority of the first MAC element is lower than a transmission priority of the data; including the Data in a medium access control Protocol Data Unit (PDU) in response to the first determination; after including the data, including the first mac element in the mac pdu if a remaining space (remaining space) in the mac pdu is sufficient for including the first mac element, in response to the first determination; and transmitting the medium access control protocol data unit to a base station.
Drawings
Fig. 1 is a diagram of a wireless communication system according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a communication device according to an embodiment of the invention.
FIG. 3 is a flow chart of an embodiment of the present invention.
FIG. 4 is a flowchart of an embodiment of a process.
FIG. 5 is a flow chart of an embodiment of the present invention.
FIG. 6 is a flow chart of a process according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
10 radio communication system
20 communication device
200 processing circuit
210 storage device
214 program code
220 communication interface device
30. 40, 50, 60 flow charts
300. 302, 304, 306, 308, 310, step
312、314、316、
400、402、404、406、408、410、412、414、416、
500、502、504、506、
600、602、604、606、608、610、612
Detailed Description
Fig. 1 is a diagram of a wireless communication system 10 according to an embodiment of the invention. The wireless communication system 10 is schematically composed of a network and a plurality of communication devices. The network communicates with a communication device via one or more carriers (carriers) in the same or different duplex modes (e.g., frequency-division multiplexing (FDD), time-division multiplexing (TDD), or resilient multiplexing).
In fig. 1, the network and the communication device simply illustrate the architecture of the wireless communication system 10. The network may be an evolved universal terrestrial radio access network (E-UTRAN) including at least one evolved Node B (eNB) or a fifth generation radio access network (5G radio access network) including at least one fifth generation Base Station (BS). A fifth generation wireless communication technology employs orthogonal frequency-division multiplexing (OFDM) or non-orthogonal frequency-division multiplexing (non-OFDM) and a Transmission Time Interval (TTI) of less than 1 millisecond (e.g., 100 or 200 microseconds) for communication between both a communication device and a base station.
The communication device may be a User Equipment (UE), a Machine Type Communication (MTC), a mobile phone, a notebook computer, a tablet computer, an electronic book, a portable computer system, a vehicle, or an airplane. In addition, the network and the communication device can be regarded as the transmitting end or the receiving end respectively according to the transmission direction. For example, for an Uplink (UL), the communication device is the transmitting end and the network end is the receiving end; for a Downlink (DL), the network is the transmitting side and the communication device is the receiving side.
Fig. 2 is a schematic diagram of a communication device 20 according to an embodiment of the invention. The communication device 20 may be used to implement the network side or the communication device in fig. 1, but is not limited thereto. The communication device 20 includes a processing circuit 200, a storage device 210, and a communication interface device 220. The processing Circuit 200 may be a microprocessor or an Application-Specific Integrated Circuit (ASIC). The storage device 210 may be any data storage device for storing a program code 214, and the processing circuit 200 may read and execute the program code 214 through the storage device 210. For example, the storage device 210 may be a Subscriber Identity Module (SIM), a Read-Only Memory (ROM), a Flash Memory (Flash Memory), a Random-Access Memory (RAM), a compact disc Read-Only Memory (CD-ROM/DVD-ROM/BD-ROM), a magnetic tape (magnetic tape), a hard disk (hard disk), an optical data storage device (optical data storage device), a non-volatile storage device (non-volatile storage device), a non-transitory computer-readable medium (e.g., a tangible medium), and the like, without being limited thereto. The communication interface device 220 may be a wireless transceiver for transmitting and receiving signals (e.g., data, signals, messages and/or packets) according to the processing results of the processing circuit 200.
In the following embodiments, the ue is used to represent the communication device in fig. 1 to simplify the description of the embodiments.
A codec deployment solution for radio access networks enables an evolved node B to transmit an uplink or downlink codec deployment indication with explicit proposed bit rate (bitrate) information to help the UE select or adjust an appropriate codec rate for voice over Long term evolution/fifth generation (LTE/5G) or video over Long term evolution/fifth generation (ViLTE/5G). In one embodiment, when the enb determines to recommend the ue to modify the bit rate, the enb transmits a bit rate recommendation (bit rate recommendation) indicating the recommended bit rate (or the recommended codec rate) to the ue in the RRC _ CONNECTED mode due to a poor radio condition or network congestion (network congestion) detected in uplink or downlink.
An assumed scenario according to an embodiment of the present invention is as follows: from the first base station, the user terminal receives or applies a bit rate recommendation (e.g., indicating a low codec rate). Then, the ue receives a handover command from the first bs, and performs a handover to the second bs according to the handover command. After performing handover to the second base station, the ue continues to use the low codec rate. However, if the second base station can provide the ue with a higher codec rate than the low codec rate, it is disadvantageous to continue using the low codec rate. In this case, the ue cannot obtain better voice/video quality after performing the handover.
Fig. 3 is a flowchart of a process 30 for performing codec rate adaptation in a ue according to an embodiment of the present invention. The process 30 includes the following steps:
step 300: and starting.
Step 302: a first bit rate recommendation is received from a first cell.
Step 304: selecting a first codec rate according to the first bit rate recommendation, and encoding (encode) a first plurality of packets according to the first codec rate.
Step 306: from the first cell, a handover command is received to configure the communication device to handover (handoff over) to a second cell.
Step 308: and executing a handover to the second cell in response to the handover command.
Step 310: after performing the handover, a bit rate query (bit rate query) is transmitted to the second cell.
Step 312: receiving a second bit rate recommendation from the second cell, wherein the second cell transmits the second bit rate recommendation in response to the bit rate query.
Step 314: selecting a second codec rate according to the second bit rate recommendation, and encoding a second plurality of packets according to the second codec rate.
Step 316: and (6) ending.
According to the process 30, after performing the handover, the ue selects (or determines) a second codec rate according to the second bitrate proposal, and encodes a second plurality of packets according to the second codec rate. That is, if the second cell can provide a codec rate higher than the first codec rate, the ue may not continuously use the first codec rate after performing the handover. The ue can select the second codec rate and encode the second plurality of packets more efficiently.
The implementation of the process 30 is not limited to the above. The embodiments described below may be applied to implement the process 30.
In one embodiment of step 310, the ue transmits a bit rate query to the second cell when the handover command sets the codec rate adjustment. When the handover command does not set codec rate adaptation, the ue does not transmit the bit rate recommendation to the second cell (e.g., the second cell does not support codec rate adaptation, so the second cell does not transmit the bit rate recommendation). In this case, after (or while) performing the handover, the ue changes the codec rate according to its own decision (in response to the handover). In an embodiment, after performing the handover (or when performing the handover), the ue decides to increase the first codec rate (in response to the handover) without receiving the second bitrate proposal to obtain better voice/video quality (e.g., when the channel quality indicator (channel quality indicator) or signal strength/quality of the second cell is better (e.g., higher than a threshold).
An assumed scenario according to an embodiment of the present invention is as follows: from the first cell, the ue receives or applies a bit rate recommendation (e.g., indicating a low codec rate). Then, the ue performs a Radio Resource Control (RRC) connection reestablishment procedure (RRC connection request procedure) due to the Radio link failure (Radio link failure) being detected. The ue re-establishes the connection to the second cell. After the rrc connection re-establishment procedure, the ue continues to use the low codec rate. However, if the second cell can provide a higher codec rate for the ue than the low codec rate, it is disadvantageous to continue using the low codec rate. In this case, the ue cannot obtain better voice/video quality after performing the rrc connection re-establishment procedure.
Fig. 4 is a flowchart of a process 40 for performing codec rate adaptation in a ue according to an embodiment of the present invention. The process 40 includes the following steps:
step 400: and starting.
Step 402: a first bit rate recommendation is received from a first cell.
Step 404: a first codec rate is selected based on the first bit rate recommendation, and a first plurality of packets are encoded based on the first codec rate.
Step 406: a radio link failure (radio link failure) on the first cell is detected.
Step 408: a Radio Resource Control (RRC) connection re-establishment procedure is performed to a second cell in response to the RRC connection failure.
Step 410: after performing the rrc connection re-establishment procedure, a bit rate query is sent to the second cell.
Step 412: receiving a second bit rate recommendation from the second cell, wherein the second bit rate recommendation is transmitted by the second cell in response to the bit rate query.
Step 414: selecting a second codec rate according to the second bit rate recommendation, and encoding a second plurality of packets according to the second codec rate.
Step 416: and (6) ending.
According to the process 40, if the second cell can provide a codec rate higher than the first codec rate, the ue may not continue to use the first codec rate after performing the handover (or when performing the rrc connection re-establishment procedure) (in response to the rrc connection re-establishment procedure). The ue can select the second codec rate and encode the second plurality of packets more efficiently.
The implementation of the flow 40 is not limited to the above. The embodiments described below may be applied to implement the process 40.
In an embodiment of step 410, the ue transmits the bit rate request to the second cell when a rrc message (e.g., RRCConnectionReconfiguration) is received after rrc connection re-establishment procedure. The RRC message sets codec rate allocation. When the radio resource control message does not set the codec rate assignment, the ue does not transmit the bit rate query to the second cell. In this case, after performing the rrc connection re-establishment procedure (or when performing the rrc connection re-establishment procedure), the ue changes the codec rate according to its own determination (in response to the rrc connection re-establishment procedure). In one embodiment, after performing the rrc connection re-establishment procedure, the ue determines to increase the first codec rate without receiving the second bitrate recommendation to obtain better voice/video quality (e.g., when the channel quality indicator (channel quality indicator) or signal strength/quality of the second cell is better (e.g., higher than a threshold)).
In one embodiment of step 410, the ue transmits the bit rate query to the second cell when receiving an rrcconnectionrequest message of the rrc connection re-establishment procedure. The rrcconnectionrequest message sets codec rate allocation. When the rrcconnectionrequest message does not set the codec rate adjustment, the ue does not transmit the bit rate query to the second cell. In this case, after the rrc connection re-establishment procedure, the ue changes the codec rate according to its own decision.
The following embodiments may be applied to implement the processes 30 and 40.
In the second cell (or via the second cell) without receiving the bit rate query, the base station transmits a second bit rate recommendation in response to the handover/rrc connection re-establishment procedure. The ue may not send the bit rate query during (or after) the handover/rrc connection re-establishment procedure.
An assumed scenario according to an embodiment of the present invention is as follows: the ue frequently transmits the bit rate query to the network, so that the network needs to frequently respond to the bit rate query, resulting in waste of wireless resources.
Fig. 5 is a flowchart of a process 50 for performing codec rate adaptation in a ue according to an embodiment of the present invention. The process 50 includes the following steps:
step 500: and starting.
Step 502: a bit rate query is transmitted to a cell of a base station.
Step 504: retransmitting the bit rate query to the cell when a response is not received in response to the bit rate query for a time period (time period).
Step 506: and (6) ending.
According to the process 50, the user terminal transmits the bit rate query infrequently. If the network does not respond to the bit rate query within the time period, the ue retransmits the bit rate query. Therefore, radio resources can be saved.
Implementations of the flow 50 are not limited to the above. The embodiments described below may be applied to implement the process 50.
In one embodiment, the time period is set by a network of the cell. In one embodiment, the response is a bit rate proposal or a reject response (reject response) for rejecting the bit rate challenge for a proposed bit rate.
An assumed scenario according to an embodiment of the present invention is as follows: when the ue is triggered (trigger) to transmit a first Medium Access Control (MAC) Control Element (CE) for bit rate inquiry, the ue may be triggered to transmit at least a second MAC Control Element. Alternatively, there may be data that the user side needs to transmit. If there are not enough resources to transmit all of the first mac element, the at least one second mac element, and the data, the ue needs to transmit first which is unknown (i.e. the priority of the first mac element, the second mac element, and the data is unknown).
Fig. 6 is a flowchart of a process 60 for performing codec rate adaptation in a ue according to an embodiment of the present invention. The process 60 includes the following steps:
step 600: and starting.
Step 602: triggering a first transmission of a first medium access control element and a second transmission of data for a bit rate inquiry or a delay budget reporting (delay budget reporting).
Step 604: a first determination (determination) is made that a transmission priority of the first media access control element is lower than a transmission priority of the data.
Step 606: the Data is included (included) in a medium access control Protocol Data Unit (PDU) in response to the first determination.
Step 608: after including the data, including the first mac element in the mac pdu if a remaining space (remaining space) in the mac pdu is sufficient for including the first mac element, in response to the first determination.
Step 610: transmitting the MAC PDU to a base station.
Step 612: and (6) ending.
According to the process 60, the ue makes a determination as to which mac control element and data need to be sent first. According to this decision, the ue first includes (e.g. configure) data in the mac pdu, since the data has a higher priority than the first mac element. If there is enough room left in the mac pdu (or when there is enough room left in the mac pdu), the ue then includes the first mac element in the mac pdu.
The implementation of the process 60 is not limited to the above. The embodiments described below may be applied to implement the process 60.
In one embodiment, the ue triggers a third transmission of a second mac element (e.g., a buffer status report mac element). Then, the ue makes a second determination that the transmission priority of the second mac element is higher than the transmission priority of the data. The ue includes a second mac element in the mac pdu in response to the second determination. After including the second mac element, the ue includes the data in the mac pdu if the remaining space in the mac pdu is sufficient for including the data. After including the second mac element and the data, the ue includes the first mac element in the mac pdu if the remaining space in the mac pdu is sufficient for including the first mac element.
In an embodiment, data is obtained by the ue from any logical channel (logical channel) except UL common control channel (UL-CCCH). When the data is acquired from the uplink common control channel, the ue determines that the data from the uplink common control channel has a higher priority than the second mac element. The client first includes the data, then includes the second mac element, and finally includes the first mac element in response to the determination.
The following embodiments may be applied to implement the processes 30, 40, 50, and 60.
In an embodiment, the first cell and the second cell belong to the same base station or different base stations (e.g., a first base station and a second base station). In one embodiment, a codec of the first codec Rate and the second codec Rate is an Automatic Multi-Rate (AMR) codec, an Automatic Multi-band (AMR-WB) codec, or an Enhanced Voice Services (EVS) codec. When the first codec rate is changed, the codec may or may not be changed.
In one embodiment, the first plurality of packets and the second plurality of packets are voice packets (voice packets) belonging to a first voice call (e.g., an Internet Protocol Multimedia Subsystem (IMS) voice call) or video packets (video packets) belonging to a second video call (e.g., an IMS video call). The user terminal transmits the encoded first plurality of packets and the encoded second plurality of packets to a second cell.
In one embodiment, the bit rate inquiry, the first bit rate suggestion, and the second bit rate suggestion are medium access control elements or radio resource control messages.
In one embodiment, before step 302, step 402 or step 502, the ue transmits a first rrc message including an indication (indication) indicating that the ue supports codec rate adaptation to a network (e.g., a base station). Then, the ue receives a second rrc message from the network for configuring the ue application codec rate. The first cell of the network transmits a second rrc message in response to the first rrc message. When the network knows that the ue supports codec rate adjustment, the network transmits a second rrc message and sets a bearer (bearer) with Quality of Service (QoS) setting (e.g., QoS Class Identifier (QCI)) for the voice call or the video call to the ue. The ue transmits a bit rate inquiry and performs bit rate recommendation in the mac element in response to the second rrc message. When the ue does not receive the second rrc message, the MAC layer of the ue does not apply the bit rate recommendation. In one embodiment, the first rrc message is a UECapabilityInformation message and the second rrc message is a RRCConnectionReconfiguration message. In one embodiment, if the ue is configured with more than one MAC entity (MAC entity) by the network, the ue applies the MAC entity responsible for transmitting the voice/video packets (e.g., the first plurality of packets and the second plurality of packets in the processes 30 and 40) to transmit the bit rate query and perform the bit rate recommendation. In one embodiment, the second rrc message specifically sets the codec rate to be adapted to a specific mac entity, so that the ue knows that the specific mac entity is used to send the bit rate query and perform the bit rate recommendation. That is, the codec rate adaptation configuration (codec rate adaptation configuration) is related to the medium access control entity configuration (MAC entity configuration).
In one embodiment, the ue receives the codec rate adaptation configuration in a radio resource control (RRC connected state). When the ue enters an RRC idle state from an RRC connected state, the ue releases the codec rate allocation configuration. The ue reserves the codec rate allocation configuration when the ue is configured by the network to suspend its RRC connection (referred to as RRC suspended state) or when the ue is configured to enter a RRC light connected state (or RRC inactive state). Therefore, when the ue enters the rrc connection state from the rrc suspended state or from the rrc light connection state, the ue transmits a bit rate query and performs a bit rate recommendation.
In one embodiment, when a media access control element is configured, its corresponding subheader is also configured. Therefore, the user side considers whether the remaining space for the mac element in the mac pdu is sufficient. The user end considers the residual space enough to configure the media access control unit and the corresponding auxiliary header.
Those skilled in the art will appreciate that the above-described embodiments can be combined, modified and/or varied in accordance with the spirit of the invention. The aforementioned statements, steps and/or processes (including the suggested steps) may be implemented by means of hardware, software, firmware (a combination of hardware means and computer instructions and data embodied in software readable by a hardware means), electronic systems or a combination thereof. For example, the device may be a communication device 20. Any of the foregoing processes may be compiled into the program code 214.
In summary, the present invention provides an apparatus and method for performing codec rate adaptation. The user terminal can select the coding and decoding rate, so that the coding and decoding process is more efficient. Accordingly, the problems in the art may be solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A communication device for performing codec rate adaptation (codec rate adaptation), comprising:
storage means for storing instructions for:
triggering (trigger) a first transmission of a first Medium Access Control (MAC) Control Element (CE) and a second transmission of data for a bit rate query (bit rate query) or a delay budget reporting (delay budget reporting);
making a first determination (determination) that a transmission priority of the first MAC element is lower than a transmission priority of the data;
including the Data in a medium access control Protocol Data Unit (PDU) in response to the first determination;
after including the data, including the first mac element in the mac pdu if the remaining space (remaining space) in the mac pdu is sufficient for including the first mac element, in response to the first determination; and
transmitting the medium access control protocol data unit to a Base Station (BS); and
the processing circuit is coupled to the storage device and configured to execute the instructions in the storage device.
2. The communications device of claim 1, wherein the storage device further stores instructions for:
triggering a third transmission by a second media access control element;
making a second determination that the transmission priority of the second medium access control element is higher than the transmission priority of the data;
including the second mac element in the mac pdu in response to the second determination;
after including the second mac element, if the remaining space in the mac pdu is sufficient for including the data, including the data in the mac pdu; and
after including the second mac element and the data, if the remaining space in the mac pdu is sufficient for including the first mac element, including the first mac element in the mac pdu.
3. A method to perform codec rate adaptation (codec rate adaptation), the method comprising:
triggering (trigger) a first transmission of a first Medium Access Control (MAC) Control Element (CE) and a second transmission of data for a bit rate query (bit rate query) or a delay budget reporting (delay budget reporting);
making a first determination (determination) that a transmission priority of the first MAC element is lower than a transmission priority of the data;
including the Data in a medium access control Protocol Data Unit (PDU) in response to the first determination;
after including the data, including the first mac element in the mac pdu if the remaining space (remaining space) in the mac pdu is sufficient for including the first mac element, in response to the first determination; and
the medium access control protocol data unit is transmitted to a Base Station (BS).
4. The method of claim 3, further comprising:
triggering a third transmission by a second media access control element;
making a second determination that the transmission priority of the second medium access control element is higher than the transmission priority of the data;
including the second mac element in the mac pdu in response to the second determination;
after including the second mac element, if the remaining space in the mac pdu is sufficient for including the data, including the data in the mac pdu; and
after including the second mac element and the data, if the remaining space in the mac pdu is sufficient for including the first mac element, including the first mac element in the mac pdu.
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| CN108039934B (en) | 2021-04-06 |
| CN112291037B (en) | 2022-06-03 |
| CN108039934A (en) | 2018-05-15 |
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