WO2011053222A1 - Adaptation du débit de codage-décodage pour la modification du débit de canal radio - Google Patents

Adaptation du débit de codage-décodage pour la modification du débit de canal radio Download PDF

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Publication number
WO2011053222A1
WO2011053222A1 PCT/SE2010/051065 SE2010051065W WO2011053222A1 WO 2011053222 A1 WO2011053222 A1 WO 2011053222A1 SE 2010051065 W SE2010051065 W SE 2010051065W WO 2011053222 A1 WO2011053222 A1 WO 2011053222A1
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WIPO (PCT)
Prior art keywords
node
rate
amr
data transmission
radio
Prior art date
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PCT/SE2010/051065
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English (en)
Inventor
Paul Schliwa-Bertling
Per-Ove Ekman
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Telefonaktiebolaget L M Ericsson (Publ)
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Filing date
Publication date
Priority claimed from US12/607,404 external-priority patent/US8200215B2/en
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to CN201080048503.6A priority Critical patent/CN102667925B/zh
Priority to EP10827232A priority patent/EP2494549A1/fr
Publication of WO2011053222A1 publication Critical patent/WO2011053222A1/fr

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Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the technical field relates to mobile radio communications, and in particular, to adapting codec rates when a radio channel rate change is needed.
  • IP Internet Protocol
  • 3GPP release 8 intends to support user plane over the A interface between the radio access network and the core network using IP (AoIP) protocol [3GPP TS 48.008] and AoIP userplane transport mechanism [3GPP TS 48.103].
  • AoIP permits the situation where transcoder equipment may only be located in the core network (e.g., a mobile gateway (MGw)), in which case, transcoder resources are not available in the radio access network.
  • MGw mobile gateway
  • An advantage of AoIP is the possibility and high probability to conduct a speech call in a Transcoder Free Operation mode (TrFO).
  • AoIP together with an adaptive voice coding, e.g., Adaptive Multi-Rate Narrowband (AMR-NB), and with the ability to operate over a wide range of voice codec bit rates can use a GSM radio network with full rate and half rate traffic channels to its full potential.
  • AMR-NB Adaptive Multi-Rate Narrowband
  • Adaptive voice coding e.g., Adaptive Multi-Rate (AMR)
  • AMR Adaptive Multi-Rate
  • the protocol enhancements for AoIP mentioned above ensure that end-to-end codec negotiation takes place at the initial call set-up between a local mobile radio node and a remote radio node, and that a TrFO mode is maintained even when a handover is required because a mobile radio node moves or when Radio Resource Management (RRM) in the radio network must adapt codec rates in mobile radio nodes to accommodate current radio conditions and/or a current radio resource situation.
  • RRM Radio Resource Management
  • the RRM output requires a change of an ongoing TrFO call to a codec that is incompatible with that currently used, e.g., GSM FR (full rate) to GSM HR (half rate) or AMR-NB to GSM EFR, then a transcoder resource must be inserted to convert between these two different codec types.
  • GSM FR full rate
  • GSM HR half rate
  • AMR-NB Mobile Switching Center
  • the codec set used for AMR-NB on a full rate traffic channel and the codec set used for AMR-NB on a half rate traffic channel are compatible (from the decoder point of view), and thus no transcoder equipment is required when a rate/mode change occurs, there is no need for explicit control signaling to the core network or to the remote mobile radio node when a change from one to another occurs.
  • the lower codec modes for both are the same.
  • the source rate of the payload generated by an AMR in the FR case with good radio conditions will not "fit" into a radio channel on the radio interface configured for AMR half rate channel.
  • a problem thus occurs when the traffic channel for the local mobile radio node, for example, is changed from full rate (F ) to half rate (HR) during a call with the remote mobile radio node.
  • the local mobile radio node starts operating at a low codec mode, known as initial codec mode, and the remote mobile radio node only adapts to the new rate after it has received the information in an AMR codec mode request (CMR) message embedded in a the AMR payload from the local mobile radio node.
  • CMR AMR codec mode request
  • the CMR message is the mechanism where the receiver node tells the sender node which codec modes that are the highest possible for the last step to the receiver. Consequently, the adaptation takes at least one round-trip-delay between the local mobile radio node and the remote mobile radio node, i.e., approximately 300-400 ms, starting from when the local mobile radio node has set-up the new radio channel which in the example above is when the local mobile radio node has changed from a traffic channel configured for full rate to a traffic channel configured for half rate.
  • All the AMR frames from the remote mobile radio node to be transmitted to the local mobile radio node over the radio interface during this time will be discarded at the radio interface until the remote mobile radio node adapts its codec rate from a codec rate above what can be transmitted on a half rate traffic channel down to a codec rate that "fits" the half rate channel.
  • the user at the local node detects audible distortion or dropouts and experiences overall decreased speech quality.
  • the new local mobile radio node and the new base station may start with a low codec mode on a half rate radio channel after the inter-BSS Handover, while the remote mobile radio node might still be using a high codec mode on a full rate radio channel until the remote node is informed of the rate change.
  • Speech signals are to be sent between a first node and a second node in a wireless communication system.
  • An adaptive multi-rate (AMR) encoder associated with each of the first and second nodes encodes speech signals in multiple modes having different degrees of robustness that correspond to different AMR source bit rates.
  • AMR adaptive multi-rate
  • the first node transmits over a radio interface at a first data transmission rate
  • the AMR encoders associated with the first and second nodes generate source data for transmission at a first AMR source bit rate.
  • a need to change the first node's first data transmission rate over the radio interface to a second different data transmission rate is determined.
  • a new AMR source bit rate is determined for the first and second nodes.
  • Information is sent to the second node, in advance of changing the data transmission rate over the radio interface, requesting the second node to change from its currently used AMR source bit rate towards the new AMR source bit rate. After a predetermined time period sufficient for the second node to change from the current AMR source bit rate to the new AMR source bit rate expires or after the second node indicates a change to the new AMR source bit rate, an indication is sent to the first node to start transmitting at the second data transmission rate over the radio interface.
  • the predetermined delay period is waited for before performing the sending step to allow sufficient time for the second node to adjust its AMR source encoding rate to the second AMR source encoding rate.
  • the AMR source encoding rate of information sent to first node is compatible with the second data transmission rate over the radio interface.
  • One non-limiting aspect of the technology includes sending information to the second node using in-band signaling in a user plane and that information is a codec mode request or command.
  • Another non-limiting aspect of the technology may include detecting a condition that indicates a need to change the first node's first data transmission rate over the radio interface.
  • One example, non-limiting application is to a GSM-based wireless communication system. If a congestion condition is detected, the change may be from a full rate radio channel and to a half rate radio channel.
  • the information sent to the second node may be a codec mode request or command, and the current AMR source rate may correspond to a full rate AMR mode and the codec mode request or command corresponds to a half rate AMR mode.
  • a timer set with a predetermined delay period may be started, and after the timer expires, an indication may be sent to the first node to start transmitting at the half rate data transmission rate over the radio interface.
  • Waiting for the predetermined delay period before performing the commanding step allows sufficient time for the second node to adjust from the full rate AMR mode to the half rate AMR mode so that the AMR source encoding rate of information sent to first node does not exceed the half rate data transmission rate over the radio interface.
  • Information may be sent to the second node so that the second node changes from the current AMR source bit rate to the new AMR source bit rate in multiple steps.
  • multiple codec mode request or commands may be sent to the second node to stepwise adjust from the full rate AMR mode down to the half rate AMR mode
  • the commanding step may include a handover command to cause the first node to start transmitting at the second data transmission rate over a half rate radio channel.
  • the second node's AMR encoder After the handover is performed, the second node's AMR encoder generates source data based on the new AMR source bit rate. By the time the handover is performed, the second node's AMR encoder is generating source data based on the new AMR source bit rate.
  • the handover is orchestrated by a base station controller that controls one or more base stations involved in the handover.
  • the handover may be orchestrated by a base station system that controls two or more base stations controllers that each control one or more base stations involved in the handover.
  • Another aspect of the technology includes determining a round trip time associated with the communication between the first node and second node, where the predetermined delay period is based on the round trip time.
  • Figure 1 is a diagram illustrating an example communication between a remote host mobile radio MS-A and a local host mobile radio MS-B;
  • Figure 2 takes the example communication from Figure 1 and provides initial AMR encoding rates assuming full rate radio channels for both the remote and local host mobile stations;
  • Figure 3 is a non-limiting, example function block diagram of a GSM based communications system showing a change in data transmission rate over a radio interface for and potential handovers of a mobile station
  • Figure 4 continues with the example from Figure 2 showing a problem situation when a radio channel transmission rate for MSB decreases
  • Figures 5A-5C are timelines that illustrate the various messages and information sent in the example of Figure 4;
  • Figure 6 is a flowchart diagram illustrating non-limiting example procedures for solving the problem illustrated in Figure 4 and Figures 5A-C;
  • Figure 7 is a non-limiting example function block diagram of a radio network node that may be used to implement the procedures of Figure 6;
  • Figure 8 is a non-limiting example function block diagram of a mobile station
  • Figure 9 is a non-limiting example function block diagram of a BSC node or BSS node that may be used to implement the procedures outlined in Figure 6 in a GSM-based communications system;
  • Figure 10 continues with the example from in Figures 1, 2, and 4 but with the problem situation solved using the approach outlined in Figure 6;
  • Figures 11 A-l IF are timelines to help explain the progression of signaling and status of the example in Figure 10 at various times;
  • Figure 12 is a non-limiting example signaling diagram for an intra - BSC intra-cell handover
  • Figure 13 is a non-limiting example signaling diagram for a variation of the an intra-BSC inter-cell handover shown in Figure 12;
  • Figure 14 is a non-limiting example signaling diagram for an inter-
  • GSM Global System for Mobile communications
  • Adapting the coding rate of source information is called codec mode adaptation and allows adapting the degree of error protection.
  • the amount of bits used for transmitting the source information and the amount of redundancy bits that are added for protecting the channel from faulty transmitted bits may be bit varied.
  • a speech codec built according to the AMR specification includes a number of codec modes with different selectable source bit rates such as: 4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, and 12.2 kbps.
  • the amount of speech coding in relation to the amount of channel coding can be adapted according the requirements set by current channel conditions. Present channel conditions are determined and used to select a codec mode that provides optimal quality for the detected conditions.
  • Examples of information that may be used to adapt the codec mode includes either channel measurement data indicating the estimated channel quality or capacity or a codec mode request (CMR) informing the sending side about the codec mode that the sending side should select.
  • CMR codec mode request
  • FR full rate
  • H half rate
  • sixteen preferred configurations of AMR codec mode are defined [see 3GPP 28.062], each including up to four codec modes.
  • FIG. 1 A mobile station MS-A, corresponding to a remote host, has established a
  • both mobile stations A and B are transmitting over a radio interface using a full rate (FR) radio channel.
  • both mobile stations A and B have AMR encoders which have been selected to operate in the 12.2 kbps AMR mode consistent with a full rate (FR) radio channel.
  • encoded speech from mobile MS-A is transferred via base station BTS-A, base station controller BSC- A, one or more networks, such as a core network, the internet, etc., BSC-B, BTS- B, and then across the radio interface to the local mobile host MS-B.
  • the local mobile host MS-B detects the channel quality of the information received over the radio interface from BTS-B, and based thereon, transmits a corresponding, suitable CMR back to the remote host MS-A in the reverse path.
  • FIG 2 shows the example in Figure 1 in which the full rate radio channels and AMR codec mode 12.2 are labeled.
  • FIG. 3 is a non-limiting, example function block diagram that helps illustrate these potential changes in a GSM type system.
  • a call is controlled by a mobile switching center (MSC) node in the core network, and this node is coupled to and supervises two (or more) base station controllers (BSCs) BSCl and BSC2.
  • BSCl supervises two (or more) base stations BS1 and BS2
  • base station controller BSC2 supervises two (or more) base stations BS3 and BS4.
  • the mobile station communicates over the radio interface at a data transmission rate 1 with base station BS1.
  • a condition is detected that makes it necessary to change that transmission rate to a second radio channel transmission rate 2 while still connected to BS1 (i.e., an intra-BSC, inter cell handover).
  • the mobile station may be moving so that it no longer is in range of base station BS1 but instead moves into range with BS2 (i.e., an intra- BSC, inter cell handover).
  • a handover is performed changing the radio channel over which the mobile station is transmitting.
  • an inter-BSC handover is performed from BS2 to BS3.
  • Each of these situations may impact the AMR coding rate in the example of Figure 2 to be used by the local and remote host mobile stations in their communication.
  • BSC-B detects congestion either in the cell being serviced by BTS-B in which local host MS-B is transmitting or in a cell in BSC-B to which MS-B must be moved due to radio coverage in the radio network where BSC-B is located.
  • Other congestion conditions may also be detected such as overload in transmission network between BSC-B and BTS-B.
  • Base station controller B then sends a command via BTS-B to move the mobile MS-B from a full rate radio channel to a half rate radio channel.
  • BSC- B also indicates to MS-B that when starting to use the new radio channel the AMR mode for the codec in the mobile station (MS-B) should be decreased to an AMR mode that is consistent with a half-rate radio channel.
  • an AMR mode of 4.75 kbps is selected.
  • MS-B sends a CMR message of 4.75 in the reverse path towards remote host MS-A.
  • MS-A continues to send encoded speech at a 12.2 kbps AMR mode, and when it reaches BTS-B, does not "fit" into the new half rate radio channel to MS-B.
  • an example of a delay before MS-A decreases its AMR coding rate may be on the order of 400 milliseconds, meaning that 400 milliseconds of speech might need to be discarded by BTS-B.
  • Figures 5A-5C are timelines that illustrate the problem situation identified in the example of Figure 4.
  • BSC-B commands MS-B to move to a half rate radio channel at time equals T x .
  • MS-B changes its transmission in the uplink (UP) to half rate (HR) and also sends a CMR equal to a half rate AMR mode of 4.75 kbps.
  • Figure 5C illustrates a situation where sufficient time has transpired such that mobile station A has now switched to transmitting at a half rate AMR mode and those half rate AMR mode speech frames are now being received by MS-B.
  • Typical example values for this time T are on the order of 400 to 500 milliseconds.
  • the following technique avoids this interrupted speech problem that is both effective and easy to implement.
  • a new AMR source coding mode request is sent to MS-A before the radio channel transmission rate for MS-B changes.
  • MS-A can change its AMR source coding mode/bit rate to a new AMR source coding mode/bit rate consistent with the radio channel transmission rate change for MS-B, or after MS-A indicates in any appropriate fashion that it has changed to the new AMR source coding mode/bit rate, the change to the second data transmission rate over the radio channel to MS-B is made.
  • FIG. 6 A non-limiting example of more general procedures that may be followed for implementing the solution to the problems identified above is now described in conjunction with the flow chart in Figure 6. These procedures may be implemented in a control node in or associated with the radio network.
  • a control node might be a BSC, BTS, or BSS.
  • Figure 6 assumes a communication is established between a first node and a second node.
  • step SI a need is detected for changing the first node's transmission rate over the radio interface to a second different transmission rate.
  • a new coding source bit rate is determined for both the first and second nodes (step S2).
  • step S3 After a predetermined time period (sufficient for the second node to change from the initial coding source bit rate to the new coding source bit rate) expires or after the second node indicates a change to the new coding source bit rate, an indication is sent to the first node to start transmitting at the second data transmission rate over the radio interface (step S4).
  • In-band signaling is preferably used to send the information in step
  • FIG. 7 illustrates a non-limiting function block diagram of a general radio network node 10 that may be used to implement the procedures outlined in the flowchart of Figure 6.
  • the radio network node includes a condition detector 12 for determining a condition that indicates a need to change the data transmission rate over the radio interface or a radio channel for a mobile station, (referred to for convenience as the local mobile station), involved in a radio communication being supervised by that radio network node 10.
  • the condition detector 12 provides that detected condition over a bus 16 to a radio resource controller 14 which makes a decision based on the detected condition to change the data transmission rate over the radio interface for the local mobile station or to handover the local mobile station to a new radio channel with a different data transmission rate.
  • This decision by the radio resource controller 14 is coordinated with a delay calculator 20 which determines a predetermined delay period before the radio resource controller sends the command for changing the data
  • the radio network node 10 may also have other communication interfaces to other nodes.
  • the delay calculator 20 may take into account such factors as roundtrip time (TT) between the local and remote host nodes, times for the local mobile station node to move to a new channel, processing times in each node, etc. Any suitable procedure for determining an estimate of the RTT may be used.
  • the radio resource controller 14 also communicates with codec controller 18 which generates commands or requests for changing the AMR codec mode or rate at the local and remote host nodes.
  • FIG. 8 is a non-limiting, example function block diagram for a mobile station 30.
  • the mobile station 30 includes a speech/channel encoder 32 that can adopt different modes of coding or different coding schemes having different degrees of robustness.
  • a radio quality detector 34 senses and/or analyzes the condition of the downlink radio channel and provides a quality indication, e.g., a CMR signal, via radio transceiver 36 on the uplink to the base station.
  • Downlink information from the base station is received via the radio transceiver and provided to a speech/channel decoder 40.
  • the decoder 40 decodes the received signal to produce speech signals that are made audible to the user of the mobile station.
  • the decoder 40 also decodes or detects in the received signal codec information derived from and/or indicating/including the measured quality or condition of the uplink channel.
  • This information can be or include a codec mode request or command is provided to the encoder 32 via the controller 28 to set the encoder 32 to operate in the codec mode corresponding to the
  • Node 50 includes a congestion controller 52, handover controller 54, communication interface(s) 56, delay timer 58, RTT and delay controller 60, and AMR codec controller 62 coupled together via bus 64.
  • the congestion controller 52 detects a congestion situation that might warrant a change of radio channel transmission rate or handover for one of the mobile stations in a communication being handled by a base station ultimately being supervised by node 50.
  • the handover controller 54 determines whether or not a change in radio channel either to one having a different transmission rate or to a different channel altogether is necessary.
  • the handover controller 54 informs the RTT and delay controller 60 and the AMR codec controller 62. New AMR source bit rate/mode CMRs are provided for delivery to both the mobile stations A and B, preferably using in-band signaling.
  • the RTT and delay controller 60 determines the predetermined delay time and inputs it to the delay timer 58. When the timer 58 expires, the handover controller 54 sends a command or other signal indicating that the radio transmission rate/channel change should be implemented.
  • the initial communication between mobiles MS-A and MS-B is based on a GSM full rate (FR) radio communications channel between mobile MS-B and its base station BTS and between mobile MS-A and its base station BTS-A as well as both mobiles A and B generating encoded speech at the full rate AMR mode 12.2 kbps.
  • FR GSM full rate
  • congestion is detected by BSC-B sufficient to require that mobile MS-B be moved to a half rate radio channel. But the shift to a half rate radio channel does not yet occur. Instead, MS- B continues to use the full rate radio channel.
  • the BSC-B then starts stepping the down the CMR sent from the B side from 12.2 first to 7.4 kbps then further to 5.90 kbps, preferably using in-band signaling. After approximately 200 milliseconds, which corresponds to a non- limiting example predetermined delay time, the BTS-B orders MS-B to move to a half rate radio channel. After receiving that order, MS-B moves to a half rate radio channel and starts transmitting at the half transmission rate at a time when the mobile MS-A is now AMR encoding at 7.4 kbps or lower rather than at 12.2 kbps.
  • the AMR encoded speech from MS-A at 7.4 kbps can "fit" in the half rate radio channel between base station BTS-B mobile station MS- B.
  • no speech frames are lost, and there is no distortion of the speech from MS-A to MS-B as there was in the situation shown in Figure 4.
  • the adverse impact on speech quality experienced by the user of MS-B in Figure 4 is advantageously eliminated.
  • Figure 11 A shows the situation at a time before time Tl and both mobiles MS-A and MS-B are transmitting in the uplink on a full rate (FR) radio channel and are sending CMRs corresponding to a full rate AMR mode.
  • FR full rate
  • Figure 1 IB the time has reached Tl where a user plane handler B, e.g., in BSC-B, determines that there is a need to change the radio transmission rate of MSB.
  • the user plane handler B inserts a CMR corresponding to a half rate AMR mode in the user plane speech frames addressed to MS-A. Note that at time Tl , there is no change in the uplink full rate channel transmission over the radio channel from the mobile station MS-B.
  • Figures 1 ID shows time Tl plus one half RTT plus the reaction time at MS-A needed for MS-A to adapt to a half rate AMR mode on the user plane. See the bolded block UP equals HR generated at MS-A.
  • Figure 1 IE shows time Tl plus a complete TT plus a reaction time at MS-B. The AMR half rate information from MS-A has reached MS-B as indicated in the bolded blocks UP equals HR.
  • Figure 1 IF shows time Tl plus RTT plus reaction time at MS-B plus a margin of uncertainty time T margill .
  • the BSC commands MS-B to transmit over the radio interface at half rate as indicated in the bolded block UP equals HR.
  • MS-B also transmits a CMR corresponding to a half rate AMR mode. There is no speech loss or distortion at MS-B as there was in Figure 5C.
  • Figure 12 shows an example signaling diagram for an intra BSC intra cell handover implemented in one non-limiting example way in a BSC.
  • Functional entities in the BSC are indicated as vertical lines as labeled at the top of each vertical line with the exception of BTS-B, MS-B, and MS-A.
  • the handover control and the traffic resources handler are made aware of a need for an intra-BSC, intra-cell compatible handover.
  • the handover controller then provides for a new radio channel for MS-B which is sent to the base station BTS-B.
  • the BTS-B waits however to perform the handover to the new channel.
  • the handover controller also starts the delay timer using the predetermined value calculated as described/ shown for example above in Figures 1 lA-1 IF.
  • the handover control also starts or initiates a codec mode rate change to an initial codec mode (ICM), which in the example above is a switch from AMR codec mode 12.2 to 7.40 and further down via 5.90 to 4.75 kbps, since the CMR is only allowed to step one codec mode every second radio frame.
  • ICM initial codec mode
  • the transmission handler transfers the active codec set and the newly-defined ICM to a user plane handler.
  • the user plane handler then starts (preferably stepwise) adaptation of the CMR that is currently originally sent by MS-B and used by MS-A to the calculated ICM (e.g., from 12.2 stepwise down to 4.75 kbps).
  • the handover control sends a radio assignment command to the Abis interface handler (Abis is the communications interface in the BSC with the BTSs), which then sends a radio assignment change (to the new radio channel) command via BTS-B to the mobile station B.
  • Abis interface handler is the communications interface in the BSC with the BTSs
  • a radio assignment change to the new radio channel
  • mobile station MS-B would then switch from full-rate to half rate radio transmission.
  • Figure 13 is a non-limiting example signaling diagram of an intra-
  • inter-cell handover similar to that shown in Figure 12 with the exception that the handover controller in the inter cell case generates a handover command rather than a radio assignment command.
  • Figure 14 illustrates a non-limiting example signaling diagram for an inter-BSC handover or an inter-system handover.
  • the handover is between two base stations that are controlled by two different BSCs or two different systems.
  • a delay timer is shown, it may be that extra delay may not be needed due to the time is takes for the MSC - new BSS signaling.

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Abstract

On code des signaux de parole devant être transmis entre un premier nœud et un second nœud par l'intermédiaire d'un système de communication sans fil au moyen d'un codage multi-débits adaptatif (AMR). On détermine un besoin de passage du premier débit de transmission de données du premier nœud sur une interface radio à un second débit de transmission de données différent. On détermine ensuite un nouveau débit binaire de la source AMR pour les données. On adresse des informations au second nœud, de manière anticipée par rapport à la modification du débit de transmission des données sur l'interface radio, demandant au second nœud de passer au nouveau débit binaire de la source AMR. Après qu'une période de temps prédéterminée suffisante pour que le second nœud passe du débit binaire actuel de la source AMR au nouveau débit binaire de la source AMR ait expiré ou après que le second nœud ait indiqué son passage au nouveau débit binaire de la source AMR, le premier nœud commence à émettre selon le second débit de transmission de données sur l'interface radio.
PCT/SE2010/051065 2009-10-28 2010-10-04 Adaptation du débit de codage-décodage pour la modification du débit de canal radio WO2011053222A1 (fr)

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Application Number Priority Date Filing Date Title
CN201080048503.6A CN102667925B (zh) 2009-10-28 2010-10-04 针对无线信道速率改变的编解码器速率适配
EP10827232A EP2494549A1 (fr) 2009-10-28 2010-10-04 Adaptation du débit de codage-décodage pour la modification du débit de canal radio

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US12/607,404 US8200215B2 (en) 2005-09-20 2009-10-28 Codec rate adaptation for radio channel rate change
US12/607,404 2009-10-28

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Cited By (8)

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