CN1870810A - Radio allocation activation time selecting method controlled by radio resource - Google Patents

Abstract

The invention discloses a radio resource control radio configuration activation time selection method. Including steps: (1) RRC obtains the transmission block number PDUnumber after RLC segmentation of the message according to the length MsgLength of the message, the length RLC_Size of the PDU of RLC; (2) according to the transmission format set TFS of the transmission channel, transmission time interval TTI, RNC The tolerant maximum block error rate Max_BLER% and PDUnumber obtain the time T_rnc required for the RNC to send the message; (3) set the time for the RNC to send a TTI data to the RLC layer of the UE to receive the data as γ; (4) according to T_rnc , the margin r, combined with the current CFNcurrent, to obtain the activation time Activation_Time; (5) filling the Activation_Time into the activation time cell in the message, and sending it to the user terminal UE through RLC and MAC.

Description

A radio resource control radio configuration activation time selection method

technical field

The present invention relates to the radio resource configuration of the user terminal UE by the radio resource control layer RRC of the universal mobile communication system UMTS, in particular, relates to the transmission of the air interface protocol radio resource control layer RRC in the terrestrial access network UTRAN of the universal mobile communication system A method for selecting an activation time in a downlink configuration message for a user terminal UE.

Background technique

In the WCDMA system, the radio resource control layer RRC (Radio Resource Control) of UTRAN is responsible for the allocation and management of radio resources, and is responsible for the mobility management of the user terminal UE on the radio access side, see Figure 1. When the RRC of UTRAN decides to configure or modify radio resources for the UE, the downlink RRC message, such as radio bearer Setup (RADIO BEARER SETUP), radio bearer reconfiguration (RADIOBEARER RECONFIGURATION), etc. are sent to UE, and at the same time, the relevant radio resources of this UE in UTRAN are established or modified, see Figure 2. In the protocol 3GPP 25.331 V6.1.0 (3GPP is an international organization known as the "Third Generation Mobile Communications Partnership Project"), the configuration validation method contained in the above message is described. There are two validation modes: immediate effect or Synchronization takes effect. Immediate effect means that the UE starts the configuration immediately after receiving the message; and synchronous effect means that UTRAN sets a certain activation time in the message, which is represented by the connection frame number CFN (Connected Frame Number). At time , UTRAN and UE start this configuration at the same time, and discard the old configuration. Then, the UE's response message will be sent to UTRAN on the new configuration.

UTRAN sends downlink RRC messages that trigger UE radio resource establishment or modification on the old configuration, and different messages have different message lengths. Due to the limited transmission capacity of the MAC transmission channel, messages with a large message length are divided at the RLC layer and sent in time division. Therefore, the difference between the configured activation time and the current time, that is, the offset of the activation time needs to be large enough to ensure that the RRC message is sent to the UE before the new UTRAN configuration takes effect. In addition, the UE sends a response message to UTRAN on the new configuration. If the activation time offset configured by UTRAN is small on the basis of ensuring the success of the signaling process, then the UE can send a response to UTRAN on the new configuration as soon as possible. messages to expedite the completion of the process. Therefore, how to select an appropriate activation time to reduce call or handover delay and improve system performance has become a problem to be solved at present.

Contents of the invention

The technical problem to be solved by the present invention is to provide a radio resource control radio configuration activation time selection method to reduce call or handover delay and improve system performance.

In order to solve the problems of the technologies described above, the present invention provides the following solutions:

A radio resource control radio configuration activation time selection method, characterized in that it comprises the following steps:

Step 1: The radio resource control layer RRC obtains the number of transport blocks after the downlink radio configuration message is divided by the radio link control layer RLC according to the length MsgLength of the downlink radio configuration message and the length RLC_Size of the protocol data unit PDU of the radio link control layer RLC PDUnumber;

Step 2: Obtain the maximum sending time for the RNC to send the downlink wireless configuration message according to the transmission format set TFS of the transmission channel, the transmission time interval TTI, the downlink maximum block error rate Max_BLER% tolerated by the wireless network control layer RNC, and the PDUnumber described in step one TTInumber and the time T_rnc required for the RNC to send the downlink wireless configuration message;

Step 3: Set a margin r according to the baseband processing time of the physical layer, the transmission time from the RNC to the base station, the time for the base station to wait for processing after receiving the data, the air transmission time and the UE processing data time;

Step 4: According to the time T_rnc required for the RNC to send the downlink wireless configuration message described in step 2, the margin r described in step 3, and in combination with the current connection frame number CFNcurrent, obtain the activation time Activation_Time for the configuration to take effect;

Step 5: Fill the effective activation time Activation_Time described in step 4 into the activation time information element in the downlink wireless configuration message, and send it to the user terminal UE through the radio link control layer RLC and medium access control layer MAC.

In the radio resource control radio configuration activation time selection method of the present invention, the number of transmission blocks after the downlink radio configuration message is divided by the radio link control layer RLC in the step 1 The PDUnumber obtained here is rounded up.

In the radio resource control wireless configuration activation time selection method of the present invention, in the second step, according to the transmission format set TFS of the transmission channel, the length RLC_Size of the RLC protocol data unit PDU in the transmission channel format set TFS can be queried to obtain The maximum number of transport blocks Trch_MaxTBNumber that can be transmitted.

In the radio resource control radio configuration activation time selection method of the present invention, the maximum sending time for the RNC to send the downlink radio configuration message in the second step

In the radio resource control radio configuration activation time selection method of the present invention, in the second step, the time required for the RNC to send the downlink radio configuration message is T_rnc=(TTInumber-1)×TTI.

In the radio resource control radio configuration activation time selection method of the present invention, an intermediate margin γ' is set in the third step, γ' includes the transmission time from the RNC to the base station, the time for the base station to wait for processing after receiving data, and Transmission time and UE data processing time, γ′≤40ms.

In the radio resource control radio configuration activation time selection method of the present invention, the margin γ=2*TTI+γ′ mentioned in step 3.

In the radio resource control radio configuration activation time selection method of the present invention, the activation time for the configuration to take effect in the step 4 Activation_Time=(T_rnc+r)/10+CFNcurrent.

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

The radio resource control radio configuration activation time selection method of the present invention can ensure that the downlink radio configuration message arrives at the user terminal UE before the configuration takes effect, and can minimize the time for the new configuration to take effect, thereby speeding up the completion of the signaling process and reducing System call, switching and other process processing time, improve system performance.

The technical problems, technical solutions and beneficial effects to be solved by the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of WCDMA air interface protocol layer.

FIG. 2 is a flow chart of UTRAN sending a downlink configuration message to UE.

Figure 3 is a flow chart of the method of the present invention.

Detailed ways

Referring to FIG. 3 , it is a flowchart of a method for selecting an activation time of a radio resource control radio configuration according to the present invention.

1. The radio resource control layer RRC obtains the number of transmission blocks PDUnumber after the downlink radio configuration message is divided by the radio link control layer RLC according to the length MsgLength of the downlink radio configuration message and the length RLC_Size of the protocol data unit PDU of the radio link control layer RLC .

That is, the number of transport blocks after the downlink wireless configuration message is divided by the radio link control layer RLC

2. According to the transmission format set TFS of the transmission channel, the transmission time interval TTI of the transmission channel mapped by RLC, the downlink maximum block error rate Max_BLER% tolerated by the wireless network control layer RNC and the PDUnumber described in step 1, the downlink wireless configuration sent by the RNC is obtained The maximum sending time TTInumber of the message and the time T_rnc required for the RNC to send the downlink radio configuration message.

Wherein, according to the transport format set TFS of the transport channel, the maximum number of transport blocks Trch_MaxTBNumber that can be transmitted that matches the length RLC_Size of the RLC protocol data unit PDU in the transport channel format set TFS can be queried;

Then, the maximum sending time for the RNC to send the downlink wireless configuration message

Then, the time T_rnc=(TTInumber-1)×TTI required for the RNC to send the downlink radio configuration message.

3. A margin r is set according to the baseband processing time of the physical layer, the transmission time from the RNC to the base station, the waiting time for processing after the base station receives data, the air transmission time, and the data processing time of the UE.

Here, an intermediate margin γ' is set. γ' includes the transmission time from the RNC to the base station, the waiting time for the base station to process the data after receiving it, the air transmission time and the UE's data processing time, and γ'≤40ms.

Said margin γ=2*TTI+γ′.

4. According to the time T_rnc required for the RNC to send the downlink wireless configuration message described in step 2, the margin r described in step 3, and combined with the current connection frame number CFNcurrent, the activation time Activation_Time for the configuration to take effect is obtained;

Then, the activation time for the configuration to take effect Activation_Time=(T_rnc+r)/10+CFNcurrent.

5. Fill the effective activation time Activation_Time described in step 4 into the activation time information element in the downlink radio configuration message, and send it to the user terminal UE through the radio link control layer RLC and the medium access control layer MAC.

Further explanation will be given below.

First, the radio resource control layer RRC sets the length MsgLength of the downlink radio configuration message, the length RLC_Size of the protocol data unit PDU of the radio link control layer RLC, the transmission time interval TTI of the transmission channel mapped by the RLC, and the downlink tolerance of the radio network control layer RNC. The maximum block error rate Max_BLER%, the transmission format set TFS of the transmission channel, and the current connection frame number CFNcurrent;

Obtain the number of transport blocks after the downlink wireless configuration message is divided by the radio link control layer RLC

Here the PDUnumber is rounded up.

Then according to the transmission format set TFS of the transmission channel, the maximum number of transmission blocks Trch_MaxTBNumber that can be transmitted that matches the length RLC_Size of the RLC protocol data unit PDU in the transmission channel format set TFS can be obtained;

Then, the maximum sending time for the RNC to send the downlink wireless configuration message is obtained

Furthermore, the time T_rnc=(TTInumber_1)×TTI required for the RNC to send the downlink radio configuration message is obtained, where the unit is ms.

Here, we can know from the WCDMA transmission process and the baseband processing process that the margin γ=2*TTI+γ′, where 2*TTI is the time for the physical layer interleaving of the base station and the UE physical layer deinterleaving, and an intermediate margin is set γ′, γ′ include the transmission delay from RNC to NODE B, the time that NODE B waits for processing after receiving data, the air transmission time, and the UE processing data time. After the verification of the actual system, the maximum value of γ' is not more than 40ms.

Then according to the time T_rnc and the margin r required for the RNC to send the message, and set an activation offset value as T_offset, after converting into the unit of CFN, obtain T_offset=(T_rnc+γ)/10=(T_rnc+ γ′+2*TTI)/10;

Combined with the current connection frame number CFNcurrent, the activation time for the configuration to take effect is obtained Activation_Time=CFNcurrent+T_offset;

Finally, fill the effective activation time Activation_Time into the activation time information element in the downlink radio configuration message, and send it to the user terminal UE through the radio link control layer RLC and the medium access control layer MAC.

The method for selecting the activation time of radio resource control wireless configuration described in the present invention is not limited to the applications listed in the specification and implementation, and it can be completely applied to various fields suitable for the present invention. For those familiar with the field Additional advantages and modifications may readily be realized, so the invention is not to be limited to the specific details, representative apparatus and examples herein without departing from the spirit and scope of the general concept defined by the claims and equivalents thereof. A pictorial example is shown and described.

Claims (9)

1, a kind of radio allocation activation time selecting method controlled by radio resource is characterized in that may further comprise the steps:

Step 1: radio resource control layer obtains the transmission block number PDUnumber of this descending radio configuration message after wireless chain control layer is cut apart according to the length RLC_Size of the protocol Data Unit of the length M sgLength of descending radio configuration message, wireless chain control layer;

Step 2: the descending maximum Block Error Rate Max_BLER% and the described PDUnumber of step 1 that tolerate according to TFS Transport Format Set, Transmission Time Interval TTI, the wireless network control layer of transmission channel obtain maximum transmitting time TTInumber and the needed time T _ rnc of wireless network control layer this descending radio configuration message of transmission that the wireless network control layer sends this descending radio configuration message;

Step 3: the pending time such as receive after the data to transmission time, the base station of base station according to physical layer Base-Band Processing time, wireless network control layer, aerial transmission time and user terminal processes data time are provided with an allowance r;

Step 4: send the needed time T _ rnc of this descending radio configuration message, the described allowance r of step 3 according to the described wireless network control layer of step 2, and, obtain the activationary time Activation_Time of configuration take-effective in conjunction with current Connection Frame Number CFNcurrent;

Step 5: the described activationary time Activation_Time that comes into force of step 4 is filled in the activationary time cell in the descending radio configuration message, sends to user terminal by wireless chain control layer, medium access control layer.

2, radio allocation activation time selecting method controlled by radio resource according to claim 1 is characterized in that: the transmission block number of descending radio configuration message described in the described step 1 after wireless chain control layer is cut apart

3, radio allocation activation time selecting method controlled by radio resource according to claim 2 is characterized in that: the transmission block number PDUnumber of descending radio configuration message after wireless chain control layer is cut apart rounds up.

4, radio allocation activation time selecting method controlled by radio resource according to claim 2 is characterized in that: can inquire about obtaining this transmission channel format and concentrate the maximum transmitted piece that can transmit of the length RLC_Size coupling of protocol data unit of wireless links control layer to count Trch_MaxTBNumber in the described step 2 according to the TFS Transport Format Set of transmission channel.

5, radio allocation activation time selecting method controlled by radio resource according to claim 3 is characterized in that: wireless network control layer described in the described step 2 sends the maximum transmitting time of this descending radio configuration message

6, radio allocation activation time selecting method controlled by radio resource according to claim 4 is characterized in that: wireless network control layer described in the described step 2 sends this needed time T _ rnc=of descending radio configuration message (TTInumber-1) * TTI.

7, radio allocation activation time selecting method controlled by radio resource according to claim 1, it is characterized in that: allowance γ ' in the middle of in described step 3, being provided with, γ ' comprises that the wireless network control layer such as receives after the data at the pending time to transmission time of base station, base station, aerial transmission time and user terminal processes data time, γ '≤40ms.

8, radio allocation activation time selecting method controlled by radio resource according to claim 6 is characterized in that: the allowance γ described in the step 3=2*TTI+ γ '.

9, radio allocation activation time selecting method controlled by radio resource according to claim 7 is characterized in that: activationary time Activation_Time=(the T_rnc+r)/10+CFNcurrent of configuration take-effective described in the described step 4.

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