CN110636035B

CN110636035B - Communication method, device and readable storage medium

Info

Publication number: CN110636035B
Application number: CN201810664731.4A
Authority: CN
Inventors: 程岳
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-06-25
Filing date: 2018-06-25
Publication date: 2020-11-20
Anticipated expiration: 2038-06-25
Also published as: CN110636035A

Abstract

The invention discloses a communication method, a communication device and a readable storage medium, belongs to the technical field of communication, and is used for solving the technical problem that context resynchronization consumes a long time. In the method, when the SIP signaling and the voice compression packet are transmitted concurrently, whether the possibility of packet loss exists can be judged in advance before the packet loss exists, negative feedback is sent to the terminal once the packet loss exists, and the triggering time of the negative feedback is advanced, so that the terminal can return the compression state as early as possible, and further the time for context resynchronization between the base station and the terminal is advanced, namely, the interval duration for the context resynchronization between the base station and the terminal is shortened, thereby reducing the probability of further packet loss and improving the efficiency and effectiveness of voice transmission.

Description

Communication method, device and readable storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a communication method, a communication apparatus, and a readable storage medium.

Background

In an LTE (Long Term Evolution ) mobile communication network, the establishment of Voice service of VOLTE (Voice Over LTE, LTE-based Voice service) is performed by SIP (Session initiation Protocol) signaling between a terminal and an IMS (IP Multimedia system) system, the SIP signaling is carried on a bearer of QCI5, the Voice data packets have the characteristics of periodic arrival and relatively fixed packet size, Voice is encoded by Adaptive Multi-Rate (AMR) Compression, and then encapsulated as IP (Internet Protocol Address) data packets are transmitted on the bearer of QCI1, the Header of Voice data packets can be compressed to 1 to 3 bytes in a ROHC (Robust Header Compression) manner, and the Header of Voice data packets can be compressed to 1 to 3 bytes in a terminal, wherein the working efficiency between the terminal and the ROHC, the compression and decompression of the voice packet are realized through the compressor and the decompressor at the two ends respectively, and in the process of compression and decompression, the compression end and the decompression end maintain a set of context information respectively, and the context information is generated according to the original IP packet. In the initial state without context, the compression end must first send an IR (initialization and Refresh) packet for the decompression end to generate context.

In the prior art, since the priority of SIP signaling transmission carried in QCI5 is higher than that of the voice compression packet in QCI1, when the SIP signaling and the voice compression packet are transmitted concurrently, the SIP signaling is transmitted preferentially, the voice compression packet is transmitted after the SIP signaling is transmitted, if the transmission time of the SIP signaling is too long, some voice compression packets to be transmitted may be discarded, so that the base station may cause decompression failure after receiving the partially discarded voice compression packet, and after the decompression failure, the base station may send negative feedback to the terminal to notify the terminal to send a more robust compression packet, so as to achieve context resynchronization between the base station and the terminal.

It can be seen that the base station sends negative feedback to the terminal for resynchronization after receiving the partially discarded voice compressed packet and failing to decompress, that is, the negative feedback for context resynchronization is triggered by the failure to decompress, which is too late, so that the time consumption for context resynchronization between the base station and the terminal is long, further leading to further deterioration of the voice packet loss, and the failure to decompress may also cause CRC (Cyclic Redundancy Check) error, further leading to the failure to decompress, and affecting the user perception.

Disclosure of Invention

Embodiments of the present invention provide a communication method, an apparatus, and a readable storage medium, which are used to solve the technical problem in the prior art that context resynchronization takes a long time, so as to shorten the time for context resynchronization, reduce a packet loss rate, and improve accuracy and efficiency of decompression.

In a first aspect, a communication method is provided, and the method includes:

determining SIP signaling to be scheduled and a voice compression packet to be transmitted; the voice compression packet to be transmitted is a voice message compressed in an ROHC mode;

determining the time length required for processing the SIP signaling to be scheduled and the number of the voice compressed packets to be transmitted;

judging whether a packet loss condition is met or not according to the determined duration and the number;

and if the packet loss condition is met, sending negative feedback to the terminal equipment so as to indicate the terminal equipment to return from the current compression state to a lower-level compression state through the negative feedback.

In one possible design, determining whether a packet loss condition is satisfied according to the determined duration and number includes:

judging whether the time length required for processing the SIP signaling to be scheduled is greater than or equal to a first preset time length or judging whether a cache for caching the voice compression packet is full;

if yes, judging whether the number of the voice compression packets to be transmitted is larger than or equal to the window length of WLSB;

and if so, determining that the packet loss condition is met.

In one possible design, sending negative feedback to the terminal device includes:

determining the type of negative feedback sent to the terminal equipment according to a first difference between the time length required for processing the SIP signaling to be scheduled and the first preset time length and a second difference between the number of the voice compressed packets to be transmitted and the window length of the WLSB;

and sending the determined type of negative feedback to the terminal equipment.

In one possible design, determining the type of negative feedback sent to the terminal device according to a first difference between a time length required for processing the SIP signaling to be scheduled and the predetermined time length and a second difference between the number of voice compressed packets to be transmitted and the window length of the WLSB includes:

if the first difference is smaller than or equal to a first preset threshold value and the second difference is smaller than or equal to a second preset threshold value, sending first negative feedback to the terminal equipment, wherein the first negative feedback is used for indicating the terminal equipment to return to an FO state;

and if the first difference is greater than the first preset threshold and the second difference is greater than the second preset threshold, sending second negative feedback to the terminal equipment, wherein the second negative feedback is used for indicating the terminal equipment to return to an IR state.

In one possible design, the method further includes:

and after sending a second preset time length for starting negative feedback to the terminal equipment, sending negative feedback to the terminal equipment again.

In one possible design, before sending negative feedback to the terminal device, the method further includes:

setting the transmission priority of the QCI1 for carrying the negative feedback to be higher than the transmission priority of the QCI5 for carrying SIP signaling, so that the negative feedback is transmitted before the SIP signaling.

In one possible design, after sending negative feedback to the terminal device, the method further includes:

the transmission priority order of QCI1 and QCI5 is restored such that the transmission priority of QCI5 is higher than the transmission priority of QCI 1.

In a second aspect, a communication apparatus is provided, the apparatus comprising:

the first determining module is used for determining the SIP signaling to be scheduled and the voice compression package to be transmitted; the voice compression packet to be transmitted is a voice message compressed in an ROHC mode;

the second determining module is used for determining the time length required for processing the SIP signaling to be scheduled and the number of the voice compressed packets to be transmitted;

the judging module is used for judging whether the packet loss condition is met or not according to the determined duration and the determined number;

and the sending module is used for sending negative feedback to the terminal equipment if the packet loss condition is met so as to indicate the terminal equipment to return from the current compression state to a lower-level compression state through the negative feedback.

In one possible design, the determining module is specifically configured to:

and if so, determining that the packet loss condition is met.

In one possible design, the sending module is specifically configured to:

and sending the determined type of negative feedback to the terminal equipment.

In one possible design, the sending module is specifically configured to:

In one possible design, the sending module is further configured to:

In one possible design, the apparatus further includes a setup module to:

before the sending module sends negative feedback to the terminal equipment, the transmission priority of the negative feedback is temporarily set to be higher than that of the SIP signaling, so that the negative feedback is transmitted before the SIP signaling.

In one possible design, the apparatus further includes a recovery module to:

and after the sending module sends negative feedback to the terminal equipment, recovering the transmission priority of the SIP signaling.

In a third aspect, a communication apparatus is provided, the apparatus comprising:

a memory for storing program instructions;

and the processor is used for calling the program instructions stored in the memory and executing the steps included in any method in the first aspect according to the obtained program instructions.

In a fourth aspect, there is provided a readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the steps included in any one of the methods of the first aspect.

In the technical scheme provided by the embodiment of the invention, when the SIP signaling and the voice compression packet are transmitted concurrently, whether the packet loss condition is met currently can be judged according to the transmission duration of the SIP signaling and the number of the voice compression packets to be transmitted, and negative feedback is sent to the terminal equipment in time when the packet loss condition is met SO as to indicate that the terminal equipment can return the current compression state, for example, from an SO state to an FO state, SO that a more stable compression message can be sent in a returned lower-level compression state, a base station can utilize the stable compression message and the terminal equipment to perform context resynchronization, and the decompression efficiency and accuracy are improved. Compared with the mode that negative feedback is triggered only when the base station fails in decompression in the prior art, the negative feedback can be sent to the terminal once packet loss is determined, the triggering time of the negative feedback is advanced, so that the terminal can return the compression state as early as possible, the time for context resynchronization between the base station and the terminal is further advanced, in other words, the interval duration for the context resynchronization between the base station and the terminal is shortened, the probability of further packet loss can be reduced, and the efficiency and effectiveness of voice transmission are improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic flow diagram of ROHC compression;

fig. 2A is a schematic diagram illustrating a transition relationship between three states of the compression side in ROHC;

fig. 2B is a schematic diagram illustrating a transition relationship between three states at the decompression end in ROHC;

FIG. 3 is a flow chart of a communication method in an embodiment of the present invention;

FIG. 4 is a block diagram of a communication device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a communication device in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. The embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

The terms "first" and "second" in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the term "comprises" and any variations thereof, which are intended to cover non-exclusive protection. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

In the embodiments of the present invention, the "plurality" may mean at least two, for example, two, three, or more, and the embodiments of the present application are not limited.

In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this document generally indicates that the preceding and following related objects are in an "or" relationship unless otherwise specified.

In order to facilitate understanding of the technical solutions provided by the embodiments of the present invention, the following description will be made on related technologies.

At the core network side, voice data forms a voice packet through different frames, frequencies, sampling rates and coding rates, and then is encapsulated into a Real-Time Transport Protocol (RTP) data packet, and finally forms an IP packet to form a VOIP, and the VOIP is transmitted to the radio access network side, and RTP voice payload is carried on a PDCP for transmission, and an ROHC technology is used for enhanced transmission, corresponding to QCI ═ 1 (i.e., QCI1) voice bearer, and before the bearer of QCI1 is established, the bearer of QCI ═ 5 (i 5) carrying SIP signaling needs to be established. The priority of the QCI5 is higher than that of the QCI1, so the transmission priority of the SIP signaling is higher than that of the voice compression packet, so under the condition of concurrent transmission that the SIP signaling and the voice compression packet need to be transmitted simultaneously, the SIP signaling is transmitted preferentially, and the voice compression packet is transmitted after the SIP signaling is transmitted.

The QCI5 adopts AM mode transmission, the voice data packet of QCI1 adopts UM transmission mode and ROHC is adopted to compress the packet header of the voice data packet, the ROHC compression process is shown in fig. 1, it can be seen that the ROHC protocol establishes context storage static and dynamic packet header fields for each data stream at both ends of the link, the compression end informs the decompression end to obtain complete static and dynamic information by sending IR messages, and the static part of the original message will not be sent any more in the subsequent message sending.

For the compression ratio (SCALE) corresponding to the SN (Serial Number) and the TS (TimeStamp) of the 16-bit RTP, WLSB (Window-based least significant bits) is adopted for encoding, the compression end only transmits K least significant bits of the original value, where K is a positive integer, and after receiving K bits, the decompression end restores the original value using the value correctly received before as a reference value. To ensure the correctness of this scheme, the compression end and the decompression end may use, for example, the following interpretation interval:

f(v_ref，k)＝[v_ref-p，v_ref+(2^k-1)-p]

where v _ ref is a reference value and P is introduced to shift the decoding interval relative to the reference value v _ ref. For values expected to always increase, P may be set to-1 and K may be set to 4 in the case of UO-0 (a header type where compression efficiency is highest) packets.

The ROHC compression process includes two working state machines, which are a compression state machine and a decompression state machine, respectively, and each ROHC-compressed stream has the two state machines, where the compression state machine corresponds to the compression end, and the decompression state corresponds to the decompression end, and for the VOLTE service system, a terminal device performing a voice call can be understood as a compression party, and a base station corresponding to the terminal device can be understood as a decompression party. Each state machine contains three states, all of which start from a low state, then gradually transition to a high state, and possibly for some reason back to the low state. There is some relationship between the two state machines, but the transitions between the two state machines need not be synchronized. The state of the compression end may often fall back to the low state, while the state of the decompression end only falls back to the low state after the context of the decompression end is destroyed. Several states that the compression state machine and the decompression state machine respectively comprise are explained below.

Referring to fig. 2A, the three compression states of the ROHC compression end are, from low to high, an IR (Initialization and Refresh) state, an FO (First-level compression) state, and an SO (Second-level compression) state, as shown in fig. 2A. When the compression end starts to work, the compression end works in the lowest state, namely the IR state, and then gradually changes to the high state, for example, after an IR message is sent and ACK fed back by the decompression end is received, the state is transferred to the high state, and when the compression end has enough confidence to determine that the decompression end has enough context information for decompressing the compression packet, the compression end keeps working in the highest state SO state. And after receiving the NACK fed back by the decompression end or STATIC-NACK, the state is returned.

The following factors mainly affect the transition between the states of the compression end:

1) change of original packet header field. In one stream, some fields in the original packet header suddenly show large changes, which causes the state of the compression end to drop, so as to synchronize the context of the compression end and the decompression end.

2) Positive feedback information (ACK) transmitted from the decompressor, which causes the state of the compressor to rise.

3) The negative feedback information transmitted from the decompressing end can cause the state of the compressing end to drop. The negative feedback information includes NACK and STATIC-NACK, and when the compression end receives NACK fed back by the decompression end, the compression end will fall back to the FO state from the SO state, and when the compression end receives STATIC-NACK fed back by the decompression end, the compression end will fall back to the IR state, for example, the compression end directly falls back to the IR state from the FO state, or falls back to the FO state from the SO state first, and then falls back to the IR state from the FO state.

The introduction of the IR state has two main purposes, one is to initialize the static context of the compression end and the decompression end at the beginning, and the other is to repair the destroyed static context. In this state, the compression end sends the entire header information, including the static part and the dynamic part, and also including some extra information, such as the context ID number. The compression side remains in this state until it is certain that the decompression side has correctly received all the static context information.

The purpose of the FO state is to efficiently compress packets that have undergone irregular changes. In a stream, this phenomenon often occurs, and some dynamic domains in the header of the stream are changed irregularly, so that it is not necessary to send all dynamic domains of the whole packet, and only those domains that are changed irregularly need to be sent. In the FO state, the compression end rarely sends the whole dynamic domain, but selectively sends the domain which changes irregularly, and the packet sent in the FO state may update the contexts of some dynamic domains and the contexts of a few static domains.

The SO state is the best state at the compression end and is also the highest level state, and in this state, the compression efficiency is the highest. This state is entered by the compression side when all fields of the header in the packet data corresponding to a stream can be compressed by the SN field of the RTP header and the compression side has enough confidence that the decompression side can decompress all other fields of the header by the SN field.

Referring to the schematic diagram of the transition relationship between the three states of the decompression end shown in fig. 2B, as shown in fig. 2B, the three compression states of the ROHC decompression end are, from low to high, an NC (No Context ) state, an SC (Static Context ) state, and an FC (Full Context ) state. The three states can be switched, but not every state can be switched to another state, and the specific switching relation is as shown in fig. 2B, it can be seen that the decompression end starts to work in the NC state, then gradually switches to the high state, and rarely falls back to the low state once entering the FC state. In the NC state, as long as a compressed packet is successfully decompressed, the decompression end directly enters the FC state and feeds back ACK to the compression end. In the FC state, as long as the compressed packet cannot be correctly decompressed for a plurality of times continuously, the FC state will be backed to the SC state and NACK is fed back to the compression end to notify the compression end to compress the voice packet header in a more robust compression manner to send a more robust compressed packet, context resynchronization is performed on the basis of ensuring the compression efficiency, and in the SC state, once a compressed packet is correctly decompressed, the FC state is immediately returned to. In the SC state, the compression end can return to the NC state only when the compression packet sent by the compression end in the FO state can not be decompressed for many times, and STATIC-NACK is fed back to the compression end so as to force the compression end to send an IR message to perform all context resynchronization.

It should be noted that, when the decompression end triggers NACK to the compression end, the current decompression adopts a step-by-step fallback method, as shown in fig. 2B, assuming that the decompression end is currently in the FC state, when there are K1 packets in the N1 packet that have failed to decompress, NACK is fed back to the compression end and the compression end transitions to the SC state. In the SC state, when K2 packets in the N2 packet fail to be decompressed, SNACK is fed back to the compression end and the compression end transitions to the NC state. That is, the state transition is a gradual fallback manner, and in the SC state, because too many buffer messages may be received all the time, the message may be a UO-0 packet, so that the message cannot be timely transitioned to the NC state to trigger the compression end to send an IR message for context resynchronization.

Referring to fig. 3, fig. 3 is a flowchart of a communication method according to an embodiment of the present invention, where the method can be applied to the decompression end, for example, a base station in a VOLTE system. The flow of the method is described below.

Step 31: determining SIP signaling to be scheduled and a voice compression packet to be transmitted; the voice compression packet to be transmitted is a voice message compressed in an ROHC mode.

As described above, there may be a situation where the SIP signaling and the voice compression packet are transmitted concurrently, for example, in the process of establishing and maintaining the voice session, the compression end and the decompression end may interact with each other to receive and send packets from and to each other, or need to determine the current real-time link condition, or need to complete corresponding operations by scheduling the SIP signaling when the terminal device performs call holding, or joins in services such as third party call, and as the session is maintained all the time, a situation where both the SIP signaling and the compressed voice packet need to be transmitted concurrently occurs.

The SIP signaling is control plane signaling generated by interaction of a compression end and a decompression end, the compressed voice packet is data of a data plane, and the transmission priority of the control plane is higher than that of the data plane, so that even if the SIP signaling and the voice compressed packet need to be transmitted simultaneously, the system can process the SIP signaling first and then transmit the voice compressed packet after the SIP signaling is processed.

Step 32: and determining the time length required for processing the SIP signaling to be scheduled and the number of the voice compressed packets to be transmitted.

The power limitation means that the terminal has reached the maximum transmission power, and in order to improve the SINR (Signal to Interference plus Noise Ratio), the power limitation problem can be effectively solved by reducing the number of RPB (physical resource block) resources for transmission. The problem of insufficient transmitting power of a terminal is reduced by reducing the number of the scheduled PRBs. However, in this way, one SDU (service Data Unit) needs to be scheduled by fragmentation at the MAC (Media Access Control) layer for multiple times, which results in a large delay. If PHR is less than or equal to 0, the network side considers that the terminal is in a Power limited state according to PHR (Power Headroom Report) reported by the terminal.

The terminal may report the channel quality periodically, and assume that when an SRS (Sounding Reference Signal) reports time K0, MCS _ init _ nonlimt (K0) sends a corresponding MCS (Modulation and Coding Scheme, Modulation and Coding strategy) level according to a single PRB expected power level at time K0, PRB _ MAX _ nonlimt is a number of PRBs scheduled when the terminal sends power according to a single PRB expected power level as maximum transmission power, and a maximum TBS (transport block ) at time K TBS 0 may be calculated according to PRB _ MAX _ nonlimt and MCS _ init _ nonlimt (K0), for example, the maximum is represented by TBS _ nonlimit.

According to the QCI5, the total data volume of the SIP signaling currently required to be processed can be known according to the current BO (Buffer occupancy) value (i.e., the value of BO 5), at this Time, for example, there may be one or more SIP signaling required to be processed, the total data volume of all the SIP signaling to be processed can be represented by BO5, that is, according to the previously calculated TBS _ limit, and then according to the case that the subframe configuration is 2, the uplink is scheduled for 2 times per subframe (the current TDD subframe type is generally configured to be 2), and the total Time duration _ limit that all the SIP signaling in the QCI5 needs to be scheduled to spend is calculated. In a specific implementation process, for example, the Time _ limit may be calculated according to formula 1, and the value in formula 1 may also be set reasonably according to different situations of subframe configuration, for example, there is a coefficient 2 in formula 1 when the subframe configuration is 2, and when the subframe configuration is other, the coefficient 2 page in formula 1 may be set flexibly.

Time _ limit ═ BO5/TBS _ limit/2 × 10ms (equation 1)

Meanwhile, the approximate length VoltePackLen of each voice compressed packet can be determined according to whether the terminal is currently in an active period or a silent period, and then the number VoltePackNum of the voice compressed packets to be transmitted can be roughly estimated according to the formula 2 according to the BO1 value and the VoltePackLen of the current QCI 1.

VoltePackNum ═ BO1/VoltePackLen (equation 2)

Step 33: and judging whether the packet loss condition is met or not according to the determined time length and the determined number.

The packet loss condition is a condition indicating that the voice compression packet to be transmitted may have lost the packet to a great extent, and if the packet loss condition is satisfied, it indicates that the voice compression packet to be transmitted is likely to be lost or the packet has started to be lost. In a specific implementation process, whether a packet loss condition is currently met can be judged according to the calculated time length required for processing the SIP signaling to be scheduled and the number of the voice compression packets to be transmitted.

In one possible implementation, it may be determined whether a time period that is taken to process SIP signaling to be scheduled is greater than or equal to a first predetermined time period, where the first predetermined time period is, for example, a discard time period timesicard set by a timer configured by the system, and as long as the discard time period timesicard is exceeded, it indicates that a buffered voice compressed packet is to be discarded.

Further, on the premise that the voice compression packet is about to be discarded or is already discarded, the voice compression to be transmitted is judgedWhether the number of the depacketizes is equal to or greater than the window length of WLSB, e.g. the window length of WLSB is 2 as indicated by 4 bits⁴If the number of all the current voice compression packets to be transmitted is smaller than the window length of the WLSB, it indicates that the voice compression packets to be transmitted are still within the interpretation interval of the WLSB, so that decompression at the decompression end is not affected, but if the number of the current voice compression packets to be transmitted is greater than or equal to the window length of the WLSB, decompression at the decompression end is affected, at this time, it is finally determined that the current packet loss condition is satisfied, that is, the packet loss condition in the embodiment of the present invention not only indicates that packet loss occurs, but also includes whether correct decompression at the decompression end is affected while packet loss occurs, if normal and correct decompression at the decompression end is affected, it can be finally determined that the packet loss condition is satisfied, which is equivalent to that on the basis of the previous packet loss condition, a condition judgment on whether the condition of the decompression end is really affected is added, so that negative feedback triggering of decompression is as accurate as possible, because the triggering of negative feedback is to realize the long context resynchronization of the decompression end and the compression end, the judgment accuracy of whether resynchronization is needed can be improved through the judgment of two layers of conditions, and the triggering and feedback of subsequent negative feedback are effective as much as possible.

Step 34: and if the packet loss condition is met, sending negative feedback to the terminal equipment so as to indicate the terminal equipment to return from the current compression state to a lower-level compression state through the negative feedback.

When the real packet loss condition is met, the packet loss is indicated to be caused because the voice compression packet to be transmitted cannot be transmitted in time due to the scheduling occupation of the SIP signaling, and such packet loss will affect the decompression of the decompression end, since it is known in advance that the correct decompression will affect the decompression end, the decompression end can be triggered to send negative feedback to the compression end before the decompression failure of the decompression end, so as to inform the compression end to rollback the compression state in advance and adopt a more robust message compression method, the more robust compressed message can realize the context resynchronization between the decompression end and the compression end, to shorten the context resynchronization time, reduce the decompression error rate at the decompression end as much as possible, and reduce the packet loss, and further, user perception and KPI (Key Performance Indicators) can be improved, and passivity is avoided in operator assessment.

In addition, when it is determined that the packet loss condition is not satisfied currently according to the foregoing determination method, it is apparent that the scheduling of the current SIP signaling does not affect the accurate decompression of the decompression end, and then no operation may be performed at this time, that is, the voice compression packet to be transmitted is transmitted after the completion of the scheduling of the SIP signaling.

As described above, since the negative feedback includes NACK and STATIC-NACK, in the implementation process, when it is determined that the packet loss condition is currently satisfied, which type of negative feedback is triggered, because the type of negative feedback is different, the compression state of the indicated compression end backoff is also different, and the compression ratio to be subsequently adopted is also different, it is also necessary to first determine which type of negative feedback is triggered before sending the negative feedback, which type of negative feedback is consistent with and matches the current actual situation.

In one possible implementation manner, the type of negative feedback sent to the compression end may be determined according to a first difference between a time length required for processing the SIP signaling to be scheduled and a first predetermined time length, and a second difference between the number of voice compressed packets to be transmitted and the window length of the WLSB. Specifically, the first difference is used to indicate a specific time exceeding the discard duration set by the system, and the number of the discarded voice compressed packets can be estimated according to the specific time, and further, the second difference is used to indicate the possibility of affecting the correct decompression at the decompression end, so the specific type of negative feedback triggered is determined by the first difference and the second difference, for example, when the first difference is close to 0 and the second difference is close to the window length of WLSB, NACK can be triggered to force the compression end to fall back to FO state, and for example, when the first difference is larger and the second difference is close to 0, STATIC-NACK can be triggered to force the compression end to fall back to IR state, thereby improving the accuracy of negative feedback.

Therefore, in an alternative embodiment, if the first difference is less than or equal to the first predetermined threshold and the second difference is less than or equal to the second predetermined threshold, the feedback of the first negative feedback is triggered to indicate that the fallback to the FO state is also shortened, i.e. the first negative feedback is NACK; if the first difference is greater than the first predetermined threshold and the second difference is greater than the second predetermined threshold, triggering a feedback second negative feedback to indicate the compression end to fall back to the IR state, i.e. the second negative feedback is STATIC-NACK.

In practice, the transmission priority of the feedback information (including positive feedback and negative feedback) is lower than that of the SIP signaling of QCI5, as with the voice packet of QCI1, after the negative feedback is triggered as described above, in order to enable the triggered negative feedback to be transmitted to the compression end as soon as possible, the transmission priority of the feedback information can be forcibly and temporarily increased at this time, specifically, the transmission priority of the negative feedback is temporarily set to be higher than that of the SIP signaling, so that the triggered negative feedback can be transmitted earlier than the SIP signaling, and thus the feedback can be transmitted to the compression end as soon as possible in time, so as to inform the compression end as soon as possible to compress the voice packet by using a robust packet compression method, so as to achieve context resynchronization of the decompression end and the compression end as soon as possible.

Further, after the negative feedback is transmitted to the compression end, the transmission priority of the SIP signaling can be recovered as soon as possible, specifically, the transmission priority of the SIP signaling higher than the transmission priority of the feedback information is recovered, so as to recover the transmission priority of various information determined in the system, and avoid causing system information transmission confusion.

In addition, after triggering the negative feedback as described above, a prohibition duration may be set for the timer, for example, the set prohibition duration is a second predetermined duration, and then the decompressor can send the negative feedback to the compressor again after the second predetermined duration when the negative feedback starts to be sent to the compressor, that is, a waiting time may be set, and the negative feedback cannot be sent to the compressor any longer and cannot be shortened within the waiting time, so as to avoid that the compressor sends long packets (for example, IR packets) continuously and frequently due to frequent negative feedback, and reduce the resource utilization efficiency. For example, after one negative feedback, at least one generation duration (for example, 20ms) of the voice packet in the activation period may be waited, or slightly longer than 20ms, so that the actual reflection of the compression end after receiving the negative feedback may be waited, and then whether the negative feedback needs to be triggered is determined according to the robust compressed message generated by the compression end based on the negative feedback, so that a small message with a large compression ratio may be used for transmission as much as possible, and the air interface efficiency is improved.

Compared with the mode that negative feedback is triggered only when the base station fails in decompression in the prior art, the technical scheme provided by the embodiment of the invention can send negative feedback to the terminal once packet loss is determined, and the triggering time of the negative feedback is advanced, so that the terminal can return the compression state as early as possible, and further the time for context resynchronization between the base station and the terminal is advanced, in other words, the interval duration for the context resynchronization between the base station and the terminal is shortened, thereby reducing the probability of further packet loss and improving the efficiency and effectiveness of voice transmission.

Based on the same inventive concept, please refer to fig. 4, where fig. 4 is a communication apparatus according to an embodiment of the present invention, and the communication apparatus may be a network device, such as a base station. The communication means may be a hardware structure, a software module, or a hardware structure plus a software module. The communication device may be implemented by a system-on-chip, which may be constituted by a chip, or may include a chip and other discrete devices.

As shown in fig. 4, the communication apparatus in the embodiment of the present invention may include a first determining module 41, a second determining module 42, a judging module 43, and a transmitting module 44. Wherein:

a first determining module 41, configured to determine an SIP signaling to be scheduled and a voice compression packet to be transmitted; the voice compression packet to be transmitted is a voice message compressed in an ROHC mode;

a second determining module 42, configured to determine a duration required for processing the SIP signaling to be scheduled, and a number of voice compressed packets to be transmitted;

a judging module 43, configured to judge whether a packet loss condition is met according to the determined duration and number;

and the sending module 44 is configured to send negative feedback to the terminal device if the packet loss condition is met, so as to instruct the terminal device to fall back from the current compression state to a lower-level compression state through the negative feedback.

In a possible implementation manner, the determining module 43 is specifically configured to determine whether a time length required for processing the to-be-scheduled SIP signaling is greater than or equal to a first predetermined time length, or determine whether a cache for caching the voice compression packet is full; if yes, judging whether the number of the voice compressed packets to be transmitted is larger than or equal to the window length of the WLSB; and if so, determining that the packet loss condition is met.

In a possible implementation manner, the sending module 44 is specifically configured to determine the type of negative feedback sent to the terminal device according to a first difference between a time length required for processing the SIP signaling to be scheduled and the first predetermined time length, and a second difference between the number of voice compressed packets to be transmitted and the window length of the WLSB; and sending the determined type of negative feedback to the terminal device.

In a possible implementation manner, the sending module 44 is specifically configured to send a first negative feedback to the terminal device if the first difference is less than or equal to a first predetermined threshold and the second difference is less than or equal to a second predetermined threshold, where the first negative feedback is used to instruct the terminal device to fall back to the FO state;

in a possible implementation, the sending module 44 is specifically configured to send a second negative feedback to the terminal device if the first difference is greater than the first predetermined threshold and the second difference is greater than the second predetermined threshold, where the second negative feedback is used to instruct the terminal device to fall back to the IR state.

In one possible embodiment, the sending module 44 is further configured to send negative feedback to the terminal device again after sending the terminal device a second predetermined time period for starting negative feedback.

In a possible implementation manner, the apparatus in this embodiment of the present invention further includes a setting module, configured to temporarily set the transmission priority of the negative feedback to be higher than the transmission priority of the SIP signaling before the sending module 44 sends the negative feedback to the terminal device, so that the negative feedback precedes the transmission of the SIP signaling.

In a possible implementation manner, the apparatus in this embodiment of the present invention further includes a recovery module, configured to recover the transmission priority of the SIP signaling after the sending module 44 sends negative feedback to the terminal device.

In this embodiment of the present invention, all relevant contents of each step related to the foregoing communication method embodiment may be referred to as a functional description of a corresponding functional module in this embodiment of the present invention, and are not described herein again.

The division of the modules in the embodiments of the present invention is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present invention may be integrated in one processor, or may exist alone physically, or two or more modules are integrated in one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

Based on the same inventive concept, as shown in fig. 5, an embodiment of the present invention further provides another communication apparatus, which may be a network device, such as a base station. The communication means may be a hardware structure, a software module, or a hardware structure plus a software module. The communication device may be implemented by a system-on-chip, which may be constituted by a chip, or may include a chip and other discrete devices.

The communication device in the embodiment of the present invention includes at least one processor 51 and a memory 52 connected to the at least one processor, and the specific connection medium between the processor 51 and the memory 52 is not limited in the embodiment of the present invention, and fig. 5 illustrates an example in which the processor 51 and the memory 52 are connected by a bus 50, where the bus 50 is represented by a thick line in fig. 5, and the connection manner between other components is merely schematically illustrated and is not limited. The bus 50 may be divided into an address bus, a data bus, a control bus, etc., and is shown with only one thick line in fig. 5 for ease of illustration, but does not represent only one bus or type of bus.

In the embodiment of the present invention, the memory 52 stores instructions executable by the at least one processor 51, and the at least one processor 51 may execute the steps included in the foregoing video caching method by executing the instructions stored in the memory 52.

The processor 51 is a control center of the communication apparatus, and can connect various parts of the entire communication apparatus by using various interfaces and lines, and perform various functions of the communication apparatus and process data by operating or executing instructions stored in the memory 52 and calling data stored in the memory 52, thereby performing overall monitoring of the communication apparatus. Alternatively, the processor 51 may include one or more processing units, and the processor 51 may integrate an application processor and a modem processor, wherein the application processor mainly handles an operating system, a user interface, application programs, and the like, and the modem processor mainly handles wireless communication. It will be appreciated that the modem processor described above may not be integrated into the processor 51. In some embodiments, the processor 51 and the memory 52 may be implemented on the same chip, or in some embodiments, they may be implemented separately on separate chips.

The processor 51 may be a general-purpose processor, such as a Central Processing Unit (CPU), a digital signal processor, an Application Specific Integrated Circuit (ASIC), a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, and may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor.

The memory 52, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory 52 may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charge Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The memory 52 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 52 in embodiments of the present invention may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

Based on the same inventive concept, the embodiment of the present invention further provides a readable storage medium, which stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to execute the steps of the communication method as described above.

In some possible embodiments, various aspects of the visual communication method provided by the present invention may also be implemented in the form of a program product including program code for causing a network device to perform the steps in the communication method according to various exemplary embodiments of the present invention described above in this specification when the program product is run on the network device.

It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the invention. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.

Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of communication, the method comprising:

determining a Session Initiation Protocol (SIP) signaling to be scheduled and a voice compression packet to be transmitted; the voice compressed packet to be transmitted is a voice message compressed in a robust packet header compression (ROHC) mode;

if the packet loss condition is met, sending negative feedback to the terminal equipment so as to indicate the terminal equipment to return from the current compression state to a lower-level compression state through the negative feedback;

wherein, before sending negative feedback to the terminal device, the method further comprises:

and temporarily setting the transmission priority of the negative feedback to be higher than the transmission priority of the SIP signaling so that the negative feedback is transmitted before the SIP signaling.

2. The method of claim 1, wherein determining whether the packet loss condition is satisfied according to the determined duration and number comprises:

if yes, judging whether the number of the voice compressed packets to be transmitted is larger than or equal to the window length of WLSB (least significant bit) based on a window;

and if so, determining that the packet loss condition is met.

3. The method of claim 2, wherein sending negative feedback to the terminal device comprises:

and sending the determined type of negative feedback to the terminal equipment.

4. A method according to claim 3, wherein determining the type of negative feedback sent to the terminal device based on a first difference between a time period required to process the SIP signaling to be scheduled and the predetermined time period and a second difference between the number of voice compressed packets to be transmitted and a window length of the WLSB comprises:

if the first difference is smaller than or equal to a first preset threshold value and the second difference is smaller than or equal to a second preset threshold value, sending first negative feedback to the terminal equipment, wherein the first negative feedback is used for indicating the terminal equipment to return to a first-stage compressed FO state;

and if the first difference is larger than the first preset threshold and the second difference is larger than the second preset threshold, sending second negative feedback to the terminal equipment, wherein the second negative feedback is used for indicating the terminal equipment to return to an initialization state and a refresh IR state.

5. The method of any one of claims 1-4, further comprising:

6. The method of claim 1, wherein after sending negative feedback to a terminal device, the method further comprises:

and recovering the transmission priority of the SIP signaling.

7. A communications apparatus, the apparatus comprising:

the first determining module is used for determining Session Initiation Protocol (SIP) signaling to be scheduled and a voice compression packet to be transmitted; the voice compressed packet to be transmitted is a voice message compressed in a robust packet header compression (ROHC) mode;

a sending module, configured to send negative feedback to a terminal device if the packet loss condition is met, so as to instruct, through the negative feedback, the terminal device to return from a current compression state to a lower-level compression state;

wherein the apparatus further comprises a setting module configured to:

8. A communications apparatus, the apparatus comprising:

a memory for storing program instructions;

a processor for calling program instructions stored in said memory and for executing the steps comprised in the method of any one of claims 1 to 6 in accordance with the obtained program instructions.

9. A readable storage medium storing computer-executable instructions for causing a computer to perform the steps comprising the method of any one of claims 1-6.