CN101005704A - Optimizing method for one key pass through service call set-up time delay based on honeycomb network - Google Patents

Abstract

The invention discloses a method for optimizing the time delay of a push-to-talk service call establishment based on a cellular network: a user equipment sends a radio resource control connection establishment request message to a radio network controller, and the message includes PoC session establishment information; the radio network control The device specifies the user equipment to pre-establish the transmission channel of the PoC radio access bearer through the radio resource control connection establishment message, and the configuration parameters of the transmission channel are set according to the highest data rate of the PoC service; the establishment of the radio access bearer and the packet data protocol context Activate, and set the quality of service parameters in the packet data protocol context according to the configuration parameters of the transmission channel; according to the quality of service parameters, the user equipment and the PoC server perform SIP signaling interaction to establish a PoC session. No matter what kind of PoC signaling and voice bearer mode is adopted in the present invention, the UMTS can pre-reserve sufficient resources for the PoC session, so as to improve the user's use effect.

Description

Optimization Method of Call Setup Delay for Push-to-Talk Service Based on Cellular Network

technical field

The invention relates to a push-to-talk technology based on a cellular network in a broadband code division multiple access system, in particular to a method for optimizing the call setup delay of a push-to-talk service based on a cellular network.

Background technique

Trunk communication, PTT (Push To Talk), as an important branch of mobile communication, is mainly used for command and dispatch communication by professional users such as public security and firefighting, and is generally networked separately. The trunking communication adopts half-duplex, one-to-one or one-to-many communication methods, the calling party only needs to press a button to connect, and the called party can answer without picking up the phone, so it has fast connection speed, reliability and safety Higher features.

With the development of mobile communication services, operators hope to implement PTT services for ordinary users in the public mobile communication network. Therefore, the OMA organization started to formulate the PoC (Push-to-talk over Cellular, based on cellular network) standard since 2003, making it possible to realize the PTT service on the public cellular network. OMA PoC has an open architecture and is independent of specific bearer technologies, so it can be easily introduced into existing networks. In addition, OMA submitted to 3GPP (3 ^rd Generation Partnership Project) the enabling protocol 23.979 for implementing PoC services under WCDMA (Wideband Code Division Multiple Access), making PoC Became the first service based on IMS (IP Multimedia Subsystem IP, multimedia subsystem).

The control plane of OMA PoC is based on SIP (Session Initiation Protocol, session initialization protocol). When establishing a PoC session, UE (User Equipment, user equipment) registers with the PoC server through SIP signaling, so that the PoC server can obtain the UE's route and negotiate voice Encoding and other information. The user plane is based on RTP (Real-time Transmission Protocol, Real-time Transmission Protocol)/RTCP (Real-time Transmission Control Protocol, Real-time Transmission Control Protocol), in which RTCP is used to transmit the right to speak control signaling, and only the right to speak The user can speak, and other users can answer; RTP carries AMR (Adapt Multititude Rate, adaptive multi-rate) voice frames, and the speaker sends the voice to the PoC server, and the PoC server performs necessary code conversion and then distributes it to other users in the conversation group. member. For RAN (Radio Access Network, wireless access network) and CN (Core Network, core network), both SIP and RTP/RTCP belong to the user plane and are carried on the IP protocol. RAN and CN establish corresponding RAB (Radio Access Bearer, radio access bearer) and PDP (Packet Data Protocol, packet data protocol) context to provide transmission channels.

The IMS-based OMA PoC architecture is shown in Figure 1. The PoC server is responsible for managing the initiation, transfer, and termination of PoC sessions and the management of users participating in PoC sessions. In addition to communicating with user terminals, the PoC server also needs to communicate with the presence Server (presentation server), XDMS (group management server), Device management (device management server), etc. exchange data and signaling, and control media device services. In IMS registration, firstly, the user establishes a PDP context, and discovers the P-CSCF (Proxy Call Session Control Function, Proxy Call Session Control Function, Interrogating Call Session Control Function), P-CSCF forwards the registration request to I-CSCF (Interrogating Call Session Control Function, negotiating call session control function), through I-CSCF querying HSS (Home Subscriber Server, local user server) to find S-CSCF (Server Call Session Control Function, service call session control function), realizes the registration process in S-CSCF.

As mentioned earlier, both the signaling plane (SIP signaling) and user plane (RTP/RTCP media stream) of PoC services are based on the IP protocol in UMTS. Generally, SIP signaling is set as Interactive (interactive) business, and RTP /RTCP media flow is set as Interactive or Streaming (flowing) type of service, SIP signaling and RTP/RTCP flow can be carried by the same PDP context, or can be carried by a separate PDP context. For UMTS (Universal Mobile Telecommunications System, Universal Mobile Communications System), PoC is an ordinary PS (packet switching) domain Interactive or Streaming service, which does not involve PoC high-level signaling and data, so the PoC call establishment process is in UMTS The part is the same as the normal PS call setup process. The typical PoC call establishment process of a UE starting from the cell idle state CELL_idle or the cell paging channel CELL_PCH/registration area paging channel URA_PCH state is shown in Figure 2 and Figure 3, where Figure 2 is the case where the user terminal is the calling terminal, Include the following steps:

S201, if the UE is the calling party, the user presses a PTT key to initiate a PoC session establishment request.

S202a, when the user equipment is in the Cell_idle state, the user equipment sets the value of Establishment Cause (establishment reason) to Originating Interactive Call (source interactive call) in the RRC Connection SetupRequest (RRC connection establishment request). When the user equipment is in the Cell_PCH/URA_PCH state, set the value of Establishment Cause (establishment cause) in Cell Update (cell update) to Originating Interactive Call (source interactive call).

S202b. The radio network controller specifies the user equipment to establish an SRB (Signaling Radio Bearer) in RRC Connection Setup (RRC connection establishment) or CellUpdate Confirm (cell update confirmation).

S203a, the user equipment sends a PDP context activation request bearing SIP.

S203b-s203d are used to carry the SIP RAB assignment and RB establishment process. Since the RB establishment process needs to increase the transmission channel, the synchronous establishment process will be adopted, and additional time delay will be generated by waiting for the activation time.

S203e, the core network replies to the user equipment to confirm that the activation of the PDP context is successful.

S204, the user equipment and the PoC server interact through SIP signaling, negotiate parameters such as an IP address and an AMR encoding rate, and establish a PoC session.

S205, if the RTP/RTCP media stream is carried in a separate PDP context, the user equipment must additionally establish a PDP context and RAB, similar to step s203, wherein the RB establishment process adopts a synchronous manner.

S206. The PoC server sends a Talk Burst Confirm message to the calling user equipment, indicating that the user equipment can start sending voice.

S207, if the RTP/RTCP media flow and SIP share a PDP context bearer, the RAB and the maximum data bit rate of the PDP context set up in step s203 are only set for SIP, so the RTP/RTCP media flow may cause congestion at this time, A large number of voice IP packets will be buffered on the user equipment or the network side, or even discarded.

S208, if the RTP/RTCP media stream and SIP share a PDP context bearer, the core network will initiate a PDP context modification process so that the maximum data bit rate meets the requirements of SIP and RTP/RTCP data, and the radio network controller will also initiate RAB accordingly The modification process, wherein the RB reconfiguration process adopts a synchronous manner.

S209, finally, both the air interface and the ground bearer meet the rate requirements of the SIP and RTP/RTCP media streams, and the voice data can be transmitted in a timely manner.

Fig. 3 is the situation that user terminal is called terminal, comprises the following steps:

S301a-s301b, the user equipment receives the paging message sent by the network, where the value of Paging Cause (paging cause) is Terminating Interactive Call (terminal interactive call).

S302a. When the user equipment is in the Cell_idle state, set the value of Establishment Cause to Terminating Interactive Call in the RRC connection establishment request. When the user equipment is in the Cell_PCH/URA_PCH state, set the value of Establishment Cause in Cell Update to Terminating Interactive Call.

S302b, the wireless network specifies the user equipment in RRC Connection Setup (RRC connection establishment) or Cell UpdateConfirm (cell update confirmation) to establish an SRB.

S303a, the user equipment sends a PDP context activation request bearing SIP.

S303b-s303d are used to carry the SIP RAB assignment and RB establishment process. Since the RB establishment process needs to increase the transmission channel, the synchronous establishment process will be adopted, and additional time delay will be caused by waiting for the activation time.

S303e, the core network replies to the user equipment to confirm that the activation of the PDP context is successful.

S304, the user equipment and the PoC server interact through SIP signaling, negotiate parameters such as an IP address and an AMR coding rate, and establish a PoC session.

S305, if the RTP/RTCP media stream adopts a separate PDP context bearer mode, the user equipment must additionally establish a PDP context and RAB, similar to step S303, wherein the RB establishment process adopts a synchronous manner.

S306. The PoC server sends a receiving talk burst to the called user equipment to prompt the user equipment to start receiving voice.

S307, if the RTP/RTCP media flow and SIP share a PDP context bearer, because the maximum data bit rate of the RAB and PDP context set up in S303 is only set for SIP, so the RTP/RTCP media flow may cause congestion at this time, a large number of Voice over IP packets will be buffered at the UE or the network side, or even discarded.

S308, if the RTP/RTCP media flow and SIP share a PDP context bearer, the CN will initiate a PDP context modification process so that the maximum data bit rate meets the requirements of SIP and RTP/RTCP data, and the RNC will also initiate the RAB modification process accordingly, wherein The RB reconfiguration process adopts a synchronous method.

S309, finally, both the air interface and the ground bearer meet the rate requirements of the SIP and RTP/RTCP media streams, and the voice data can be transmitted in a timely manner.

In the PoC system, the call establishment delay is an important performance index, which is divided into the calling establishment delay and the called establishment delay. Caller setup delay refers to the time interval between when the calling user presses the PTT button and hears the voice prompt tone; the called setup delay refers to the time interval from when the calling user presses the PTT button to when the called user hears the voice time interval.

In the existing solution, if two PDP contexts are used to carry PoC signaling and voice respectively, two RAB and PDP context establishment processes are required before receiving a Talk Burst Confirm or a Receiving Talk Burst message. Among them, the synchronous RB establishment process will cause the calling party's establishment delay (or the called party's establishment delay) to be relatively long. If a PDP context is used to carry PoC signaling and voice, although there is only one RAB and PDP context establishment process before the UE receives Talk Burst Confirm (or Receiving Talk Burst), due to the maximum data bit rate of the previously established RAB and PDP context If it does not meet the requirements of the RTP/RTCP media stream, the RAB and PDP context need to be modified, which may cause a long delay in the establishment of the called party or poor call quality, affecting the user experience.

Contents of the invention

The problem to be solved by the present invention is to provide a method for optimizing the call establishment delay of a push-to-talk service based on a cellular network, so as to overcome the disadvantage of prolonging the establishment of a PoC session by adopting a synchronous RB establishment process in the prior art.

In order to achieve the above object, the present invention provides a method for optimizing the call setup delay of a push-to-talk service based on a cellular network, comprising the following steps:

A. The user equipment sends a radio resource control connection establishment request message to the radio network controller, and the message includes PoC session establishment information;

B. The radio network controller designates the user equipment to pre-establish the transmission channel of the PoC radio access bearer through the radio resource control connection establishment message, and the configuration parameters of the transmission channel are set according to the highest data rate of the PoC service;

C. Establishing a radio access bearer and activating a packet data protocol context, and setting a quality of service parameter in the packet data protocol context according to configuration parameters of the transmission channel;

D. According to the quality of service parameter, the user equipment performs SIP signaling interaction with the PoC server to establish a PoC session.

After step D also include:

E. Modify the radio bearer setting and packet data protocol context according to the maximum data rate corresponding to the speech coding rate negotiated between the user equipment and the PoC server.

The PoC session establishment information includes calling PoC session establishment information and called PoC session establishment information.

In step A, when receiving paging from the network side as a calling terminal or as a called terminal, the user equipment notifies the radio network controller to establish a PoC session.

When the user equipment is used as the called terminal, the specific process includes:

The core network sends a paging message to the radio network controller, and the message includes the called PoC session establishment information;

The radio network controller sends the called PoC session establishment information to the user equipment through a paging type 1 message.

The pre-established transmission channels in step B include: SIP transmission channel and RTP/RTCP transmission channel. When using one PDP to carry up and down, SIP and RTP/RTCP use one transmission channel; when using two PDPs to carry up and down, SIP and RTP /RTCP uses one transport channel each.

Step B further includes:

B1. The user equipment sends a radio resource control connection establishment request or a cell update to the radio network controller, and the request includes calling/called PoC session establishment information;

B2. The radio network controller confirms that the designated user equipment pre-establishes the PoC radio access bearer transmission channel according to the highest transmission rate of the PoC through radio resource control connection establishment or cell update.

Step C specifically includes: performing radio access bearer establishment and packet data protocol context activation of SIP signaling and RTP/RTCP signaling, and setting quality of service parameters according to configuration parameters of the transmission channel.

Step C specifically includes: establishing the wireless access bearer of the SIP signaling and activating the packet data protocol context, and setting the quality of service parameters according to the configuration parameters of the transmission channel.

Step C further includes:

C1. The user equipment sends a packet data protocol context activation request to the core network;

C2. The core network sends a radio access bearer assignment request to the radio network controller;

C3. The radio network controller establishes a radio bearer asynchronously;

C4. The radio network controller sends a radio access bearer assignment response to the core network;

C5. The core network sends an activation packet data protocol context response to the user equipment.

Step C3 further includes: establishing radio bearer mapping and radio link control protocol RLC information.

After step C or after step D, it also includes setting up radio access bearers and activating packet data protocol contexts for RTP/RTCP signaling.

After step C, the maximum transmission data rate supported by the user equipment is set in the quality of service parameter in the packet data protocol context activation request; after step D, the quality of service parameter in the packet data protocol context activation response is set to the voice negotiated between the user equipment and the PoC server The highest data rate that the code rate corresponds to.

Step E obtains the IP address and the adaptive multi-rate coding rate through SIP signaling interaction.

Compared with the prior art, the present invention has the following advantages:

No matter what kind of PoC signaling and voice bearer mode (one PDP context or two PDP contexts) is adopted in the present invention, the UMTS can pre-reserve sufficient resources for PoC sessions, so as to improve the user's use effect.

For the case of using a PDP context to carry SIP and RTP/RTCP, since the RNC pre-establishes the PoC service-related transmission channel during the RRC establishment or cell update process, the asynchronous RB establishment process can be used in the subsequent RAB assignment process. It can avoid the delay caused by waiting for the activation time during the establishment of synchronous RB; at the same time, the RAB and PDP context established before the UE and PoC negotiate the voice coding rate are configured according to the maximum possible data bit rate of the PoC service, avoiding In the existing solution, when RAB and PDP context are established, only SIP signaling is considered, which leads to congestion of RTP/RTCP media flow.

For the case of using two PDP contexts to carry SIP and RTP/RTCP respectively, on the one hand, the delay of the RAB assignment process of SIP and RTP/RTCP is shortened by pre-establishing the transmission channel related to SIP and RTP/RTCP; on the other hand, UE You can choose not to wait for the voice coding rate negotiation with the PoC server, but to initiate the RTP/RTCP PDP context activation process in advance according to the maximum possible RTP/RTCP data bit rate of the PoC service, so that it can be compared with the SIP PDP context activation process and/or UE and The SIP signaling interaction process of the PoC server is parallel to achieve the purpose of further reducing the PoC session establishment delay.

Description of drawings

Figure 1 is a structural diagram of an IMS-based PoC network;

Fig. 2 is a flow chart of establishing a PoC call initiated by a calling user equipment from an idle state in the prior art;

Fig. 3 is a flow chart of setting up a PoC call initiated by a called user equipment from an idle state in the prior art;

Fig. 4 is a flowchart of the basic principles of the present invention;

Fig. 5 is a flow chart of establishing a PoC session when the calling user equipment of the present invention adopts a PDP context;

Fig. 6 is when the called user equipment of the present invention adopts a PDP context, the flowchart of PoC session establishment;

FIG. 7 is a flow chart of establishing a PoC session when the calling user equipment of the present invention adopts two PDP contexts;

Fig. 8 is a flow chart of establishing a PoC session when the called user equipment adopts two PDP contexts according to the present invention.

Detailed ways

A kind of optimization method of the push-to-talk service call establishment time delay based on cellular network of the present invention, as shown in Figure 4, comprises the following steps:

In step s401, the user equipment sends a radio resource control connection establishment request message to the radio network controller, and the message includes PTT session establishment information. Wherein, the PoC session establishment information includes calling PoC session establishment information and called PoC session establishment information. In addition, when the user equipment as the calling terminal or as the called terminal receives paging from the network side, it notifies the radio network controller to establish a PoC session. When the user equipment is the called terminal, the specific process includes: the core network sends the radio network controller A paging message, the message includes the called PoC session establishment information, and the radio network controller sends the called PoC session establishment information to the user equipment through a paging type 1 message.

Step s402, the radio network controller designates the user equipment to pre-establish the transmission channel of the PoC radio access bearer through the radio resource control connection establishment message, and the configuration parameters of the transmission channel are set according to the highest data rate of the PoC service . Among them, the pre-established transmission channels include: SIP transmission channel and RTP/RTCP transmission channel. When using one PDP to carry up and down, SIP and RTP/RTCP use one transmission channel; when using two PDPs to carry up and down, SIP and RTP/RTCP RTCP each uses a transport channel. The specific process includes: the user equipment sends a radio resource control connection establishment request or a cell update request to the radio network controller, and the request includes source/terminal PoC session establishment information; the radio network controller confirms the specified radio resource control connection establishment or cell update. The user equipment pre-establishes the transmission channel of the PoC radio access bearer according to the maximum transmission rate of the PoC.

Step s403, establishing a radio access bearer and activating a packet data protocol context, and setting a quality of service parameter in the packet data protocol context according to configuration parameters of the transmission channel. Carry out SIP signaling and RTP/RTCP signaling radio access bearer establishment and packet data protocol context activation, and set service quality parameters according to the configuration parameters of the transmission channel; or perform SIP signaling radio access bearer establishment and grouping The data protocol context is activated, and quality of service parameters are set according to the configuration parameters of the transmission channel.

Step s404, according to the quality of service parameter, the user equipment performs SIP signaling interaction with the PoC server to obtain information such as IP address and AMR encoding rate, and establishes a PoC session. After step s404, the radio bearer setting and the packet data protocol context may be modified according to the maximum data rate corresponding to the speech coding rate negotiated between the user equipment and the PoC server.

The present invention will be described in detail below in conjunction with specific embodiments.

When the user equipment is the calling terminal and uses a PDP context, the PoC session establishment process is shown in Figure 5:

In step s501, the user terminal presses the PTT key to initiate a PoC session establishment request.

Step s502a, when the user terminal is in the Cell_idle (cell idle) state, set the value of Establishment Cause to OriginatingPoC Session Setup in the RRC CornnectionSetup Request (RRC connection establishment request). When the user terminal is in the Cell_PCH/URA_PCH state, set the value of Establishment Cause to Originating PoCSession Setup in Cell Update (Cell_PCH/URA_PCH state).

In step s502b, the radio network controller specifies the user equipment in the RRC Connection Setup or Cell UpdateConfirm to pre-establish a PoC RAB-related transmission channel, and the setting of the configuration parameters should refer to the highest possible data bit rate of the PoC service.

Step s503a, the UE sends a PDP context activation request, where the maximum data bit rate in the QoS Requested parameter should be set to MBR _SIP + MBR _{UE_supported} , where MBR _SIP is the maximum data bit rate of SIP signaling, and MBR _{UE_supported} is the highest PoC voice supported by the UE The maximum data bit rate corresponding to the encoding rate (voice frame plus RTP, UDP, IP header overhead).

Steps s503b-s503d, RAB assignment and RB establishment process, since the transmission channel related to PoC RAB has been established in step s402, the RB establishment process adopts asynchronous mode to avoid delay caused by waiting for activation time. In order to ensure that the asynchronous RB establishment method can be adopted, the radio network controller will not reconfigure the transmission channel even if the maximum data bit rate supported by the transmission channel established in step s402 exceeds the requirement of the RAB.

In step s503e, the core network replies to the user equipment to confirm that the PDP context is activated successfully.

In step s504, the user equipment performs SIP signaling interaction with the PoC Server to establish a PoC session.

In step s505, the PoC server sends a Talk Burst Confirm message to the calling user equipment, indicating that the user can start sending voice.

Step s506, since the maximum data bit rate supported by the previously established RAB and PDP context is equal to or greater than the maximum data bit rate corresponding to the voice coding rate negotiated between the UE and the PoC server (denoted as MBR _{UE_PoC_negotiated} ), the RTP/RTCP media stream It can be sent out smoothly without congestion caused by insufficient bandwidth.

Step s507, if the maximum data bit rate supported by the RAB and PDP context is greater than MBR _{UE_PoC_negotiated} , for the sake of saving network resources, the network can initiate the RAB and PDP context modification process so that the maximum data bit rate supported by the RAB and PDP context is equal to MBR _{UE_PoC_negotiated} .

When the user equipment is the called terminal and uses a PDP context, the PoC session establishment process is shown in Figure 6:

In steps s601a-s601b, the user equipment receives the paging message sent by the network, where the value of PagingCause (paging reason) is Terminating PoC Session Setup (terminal PoC session establishment).

Step s602a, when the user terminal is in the Cell_idle (cell idle) state, set the value of Establishment Cause to Terminating PoC Session Setup in the RRC ConnectionSetup Request (RRC connection establishment request). When the user terminal is in the Cell_PCH/URA_PCH state, set the value of Establishment Cause to Terminating PoC Session Setup in Cell Update (Cell_PCH/URA_PCH state).

In step s602b, the RNC specifies the user equipment in the RRC Connection Setup or Cell Update Confirm to pre-establish a PoC RAB-related transmission channel, and the setting of the configuration parameters should refer to the highest possible data bit rate of the PoC service.

Step s603a, the user equipment sends a PDP context activation request, wherein the maximum data bit rate in the QoS Requested parameter should be set to MBR _SIP +MBR _{UE_supported} , wherein MBR _SIP is the maximum data bit rate of SIP signaling, and MBR _{UE_supported} is the highest data bit rate supported by the user equipment The maximum data bit rate corresponding to the PoC voice coding rate (voice frame plus RTP, UDP, IP header overhead).

Steps s603b-s603d, RAB assignment and RB establishment process, since the PoCRAB-related transmission channel has been established in step s502b, the RB establishment process adopts asynchronous mode to avoid delay caused by waiting for activation time. In order to ensure that the asynchronous RB establishment method can be adopted, the radio network controller will not reconfigure the transmission channel even if the maximum data bit rate supported by the transmission channel established in step s502b exceeds the requirement of the RAB.

In step s603e, the core network replies to the user equipment to confirm that the activation of the PDP context is successful.

In step s604, the user equipment exchanges SIP signaling with the PoC server to establish a PoC session.

In step s605, the PoC server sends a Receiving Talk Burst to the called user equipment, prompting the user equipment to start receiving voice.

Step s606, since the maximum data bit rate supported by the RAB and PDP context established before is equal to or greater than the maximum data bit rate (denoted as MBR _{UE_PoC_negotiated} ) corresponding to the voice coding rate negotiated between the user equipment and the PoC server, the RTP/RTCP media Streams can be sent out smoothly without congestion caused by insufficient bandwidth.

Step s607, if the maximum data bit rate supported by the RAB and PDP context is greater than MBR _{UE_PoC_negotiated} , for the sake of saving network resources, the network can initiate the RAB and PDP context modification process, so that the maximum data bit rate supported by the RAB and PDP context is equal to MBR _{UE_PoC_negotiated} .

When the user equipment is the calling terminal and uses two PDP contexts, the PoC session establishment process is shown in Figure 7:

Steps s701-s702a are the same as those in FIG. 5 and will not be repeated here.

In step s702b, the radio network controller specifies the user equipment in RRC Connection Setup or Cell UpdateConfirm to establish SIP and RTP/RTCP-related transmission channels in advance, and the setting of RTP/RTCP-related transmission channel configuration parameters should refer to the highest possible PoC service data bit rate.

In step s703a, the user equipment sends a SIP-related PDP context activation request.

Steps s703b-s703d, the process of RAB assignment and RB establishment, since the SIP-related transmission channel has already been established, the RB establishment process adopts asynchronous mode to avoid delay caused by waiting for activation time.

In step s703e, the core network replies to the user equipment to confirm that the activation of the PDP context is successful.

In step s704, the user equipment exchanges SIP signaling with the PoC server to establish a PoC session.

In step s705, the user equipment initiates the RTP/RTCP-related PDP context activation process. Since the RTP/RTCP-related transmission channel has been established, the RB establishment process adopts an asynchronous method to avoid delay caused by waiting for the activation time. This step can be carried out at any time after s702 and before s706, if this step is carried out before the user equipment and the PoC server negotiate the voice coding rate parameter, then the maximum data bit rate of QoS Requested in the PDP context activation request should be set as MBR _{UE_supported} ; if This step is performed after the user equipment and the PoC server negotiate the speech coding rate parameter, then the maximum data bit rate of QoS Requested in the PDP context activation request should be set to MBR _{UE_PoC_negotiated} . In order to ensure that the asynchronous RB establishment method can be adopted, even if the maximum data bit rate supported by the transmission channel established in s703 exceeds the requirement of the RAB, the RNC will not reconfigure the transmission channel.

In step s706, the user equipment receives a Talk Burst Confirm message, prompting the user to start sending voice.

Step s707, since the maximum data bit rate supported by the previously established RTP/RTCP-related RAB and PDP context is equal to or greater than MBR _{UE_PoC_negotiated} , the RTP/RTCP media stream can be sent smoothly without bandwidth shortage congestion.

Step s708, if the maximum data bit rate supported by the RTP/RTCP-related RAB and PDP context is greater than MBR _{UE_PoC_negotiated} , for the sake of saving network resources, the network can initiate the RTP/RTCP-related RAB and PDP context modification process, so that the RTP/RTCP The maximum data bit rate supported by the associated RAB and PDP context is equal to MBR _{UE_PoC_negoitated} .

When the user equipment is the called terminal and uses two PDP contexts, the PoC session establishment process is shown in Figure 8:

Steps s801a-s802a are the same as those in FIG. 6 and will not be repeated here.

In step s802b, the radio network controller specifies the user equipment in RRC Connection Setup or Cell UpdateConfirm to establish SIP and RTP/RTCP-related transmission channels in advance, and the setting of RTP/RTCP-related transmission channel configuration parameters should refer to the highest possible PoC service data bit rate.

In step s803a, the user equipment sends a SIP-related PDP context activation request.

Steps s803b-s803d, RAB assignment and RB establishment process, since the SIP-related transmission channel has been established in s802, the RB establishment process adopts asynchronous mode to avoid delay caused by waiting for activation time.

In step s803e, the core network replies to the user equipment to confirm that the activation of the PDP context is successful.

In step s804, the user equipment exchanges SIP signaling with the PoC server to establish a PoC session.

In step s805, the user equipment initiates the RTP/RTCP-related PDP context activation process. Since the RTP/RTCP-related transmission channel has been established in s702, the RB establishment process adopts an asynchronous method to avoid delay caused by waiting for the activation time. This step can be carried out at any time after s802 and before s806, if this step is carried out before the user equipment and the PoC server negotiate the voice coding rate parameter, then the maximum data bit rate of QoS Requested in the PDP context activation request should be set as MBR _{UE_supported} ; if This step is performed after the user equipment and the PoC server negotiate the speech coding rate parameter, then the maximum data bit rate of QoS Requested in the PDP context activation request should be set to MBR _{UE_PoC_negotiated} . In order to ensure that the asynchronous RB establishment method can be adopted, even if the maximum data bit rate supported by the transmission channel established in s802 exceeds the requirement of the RAB, the radio network controller will not reconfigure the transmission channel.

In step s806, the user equipment receives a Talk Burst Confirm message, prompting the user to start sending voice.

Step s807, since the maximum data bit rate supported by the previously established RTP/RTCP-related RAB and PDP context is equal to or greater than MBR _{UE_PoC_negotiated} , the RTP/RTCP media stream can be sent smoothly without bandwidth shortage congestion.

Step s808, if the maximum data bit rate supported by the RTP/RTCP-related RAB and PDP context is greater than MBR _{UE_PoC_negotiated} , for the sake of saving network resources, the network can initiate the RTP/RTCP-related RAB and PDP context modification process, so that the RTP/RTCP The maximum data bit rate supported by the associated RAB and PDP context is equal to MBR _{UE_PoC_negotiated} .

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (14)

1, a kind of optimization method of the PTT service call setup delay based on cellular network is characterized in that, may further comprise the steps:

A, subscriber equipment send the Radio Resource control connection to radio network controller and set up request message, comprise in this message that PoC session sets up information;

B, described radio network controller are set up the transmission channel that message designated user equipment is set up described PoC RAB in advance by the Radio Resource control connection, and the configuration parameter of described transmission channel is set according to the peak data rate of described PoC service;

C, carry out that RAB is set up and packet data protocol context activation, and QoS parameter in the described block data protocol context is set according to the configuration parameter of described transmission channel;

D, according to described QoS parameter, subscriber equipment and PoC server carry out the SIP Signalling exchange, set up PoC session.

2, according to claim 1 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, also comprise behind the step D:

E, revise radio bearer setting and block data protocol context according to the corresponding maximum data rate of the speech encoding rate of subscriber equipment and PoC server negotiate.

According to claim 1 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that 3, described PoC session is set up information and comprised that the caller PoC session is set up and called PoC session is set up information.

4, as described in the claim 3 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, in the steps A, when subscriber equipment received network side paging as calling terminal or as terminal called, the notice radio network controller was set up PoC session.

5, as described in the claim 4 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that subscriber equipment is during as terminal called, detailed process comprises:

Core network sends beep-page message to radio network controller, comprises in the described message that called PoC session sets up information;

Described radio network controller is set up information by paging Class1 message Paging Type1 with described called PoC session and is issued subscriber equipment.

6, according to claim 1 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, the transmission channel of setting up in advance among the step B comprises: SIP transmission channel and RTP/RTCP transmission channel, when using a PDP to carry up and down, SIP and RTP/RTCP use a transmission channel; When using two PDP to carry up and down, SIP and RTP/RTCP respectively use a transmission channel.

7, as described in the claim 6 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that step B further comprises:

B1, subscriber equipment send the Radio Resource control connection to radio network controller and set up request or cell update, comprise in this request that caller/called PoC session sets up information;

B2, described radio network controller are set up by the Radio Resource control connection or cell update affirmation designated user equipment is set up PoC RAB transmission channel in advance according to the maximum transmission rate of PoC.

8, according to claim 1 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, step C is specially: the RAB that carries out SIP signaling and RTP/RTCP signaling is set up and packet data protocol context activation, and according to the configuration parameter of described transmission channel QoS parameter is set.

9, according to claim 1 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, step C is specially: the RAB that carries out the SIP signaling is set up and packet data protocol context activation, and according to the configuration parameter of described transmission channel QoS parameter is set.

10, as described in claim 8 or 9 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that step C further comprises:

C1, subscriber equipment send to core network and activate packet data protocol context request;

C2, core network send the wireless access load-bearing allocation request to radio network controller;

C3, the asynchronous radio bearer of setting up of described radio network controller;

C4, described radio network controller send the wireless access load-bearing allocation response to described core network;

C5, described core network send to subscriber equipment and activate the block data protocol context response.

11, as described in the claim 10 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that step C3 further comprises: set up radio bearer mapping and radio link control RLC information.

12, as described in the claim 9 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, also comprise the RAB foundation and the packet data protocol context activation that carry out the RTP/RTCP signaling after the step C or after the step D.

13, as described in the claim 12 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that, the maximum transmission data rate that subscriber equipment is supported is set in the QoS parameter after the step C in the packet data protocol context activation request; Be set to the subscriber equipment peak data rate corresponding in the QoS parameter after the step D in the packet data protocol context activation response with the speech encoding rate of PoC server negotiate.

14, as described in the claim 2 based on the optimization method of the PTT service call setup delay of cellular network, it is characterized in that step e obtains IP address, adaptive multi-rate coding speed by the SIP Signalling exchange.

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