CN100411483C - Method for controlling service cell updating - Google Patents

Abstract

The invention discloses a method for updating a serving cell. The method includes: an RNC sends an update preparation message to a source base station, and the source base station counts the amount of data to be sent by the UE, and feeds back to the RNC to obtain the remaining sending time or directly obtains the remaining sending time from the source base station. send time. The RNC stops sending data to the source base station, and notifies the target base station to update the serving cell. The RNC configures an activation time that is numerically greater than the remaining sending time, and sends it to the target base station and the UE. After the UE finishes updating the serving cell, the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell at a time corresponding to the activation time. In the present invention, the data to be sent stored in the source base station can be sent to the UE in time before the activation time of the source base station sending data, thereby effectively avoiding the data loss caused by the UE updating the serving cell.

Description

A kind of serving cell update control method

technical field

The present invention relates to wireless communication technology, in particular to serving cell update technology.

Background technique

High Speed Downlink Packet Access (HSDPA, High Speed Downlink Packet Access) is an important feature of the fifth version of WCDMA technology. Its introduction adds three channels, namely the high-speed physical downlink shared channel for transmitting data information on the downlink ( HS-PDSCH), high-speed shared control channel (HS-SCCH) for transmitting downlink control information, and high-speed dedicated physical control channel (HS-DPCCH) for transmitting uplink feedback information.

Since the data scheduling and flow control functions between different users are moved to the base station (NodeB) in the HSDPA technology, in the downlink direction, only one cell can transmit data to the receiving user. On the contrary, a user can establish a dedicated physical channel DPCH communication connection with multiple cells in the downlink, and the dedicated physical channel DPCH of multiple cells transmits the same data to the user at the same time, so the user at the receiving end can receive signals from different cells And perform proper combination to achieve better receiving performance. A user who has established DPCH communication with multiple cells is called a soft handover user.

As shown in Figure 1, user 1 and cell 1 and cell 2 have established two dedicated channels DPCH at the same time, therefore, user 1 enters the soft handover state, while user 2 only establishes a communication connection with cell 3 and does not enter soft handover state. All cells that maintain DPCH channel connections with users are usually called active set cells, and cells that have established HS-PDSCH channel connections are called serving cells of HS-PDSCH channels, that is to say, serving cells of HS-PDSCH channels must be active One of the clusters.

Due to the movement of the user, the active set cells of the user will change dynamically. Generally speaking, when a user approaches an adjacent cell, if the signal of the adjacent cell is higher than a preset threshold, the system will add the cell to the user's active set, that is, the cell and the user On the contrary, when a user is far away from a cell in the active set, if the signal of the cell is lower than a preset threshold, the system will delete the cell from the active set.

As shown in Figure 2, when the source cell and the target cell in the HS-DSCH serving cell update process belong to different base stations, in the current technology, due to the high-speed media access control (MAC_hs) entity of the base station to which the source serving cell belongs during the update process Reset, resulting in the loss of data stored in the MAC-hs entity cache in the base station.

For services that are transmitted in a non-confirmation mode by the high-level, the data loss of the base station means that the receiving end cannot receive complete data, resulting in a decline in service quality, such as discontinuous video images and audio interruptions.

For the high-level business that uses confirmation to transmit data, the data loss of the base station means that the RNC needs to resend the data to the MAC_hs entity of the newly established base station through the interface between the RNC and the base station to which the new serving cell belongs. On the one hand, the interface On the other hand, because the RNC can only determine which data has not been correctly sent to the UE by the source base station after receiving the status report from the UE, and then according to the indication of the status report, the data that was lost The data is resent to the new base station, which brings additional delay.

Contents of the invention

The purpose of the present invention is to reduce the data loss caused by users performing HS-DSCH serving cell update between different base stations and improve service quality by rationally controlling the serving cell update process.

In order to solve the problems of the technologies described above, the technical solution of the present invention comprises the following steps:

A. The radio network controller RNC sends an update preparation message to the source base station;

B. The source base station counts the amount of data to be sent by the user UE and sends it to the RNC;

C. The RNC stops sending data to the source base station, and notifies the target base station to update the serving cell;

D. The RNC obtains the remaining sending time based on the amount of data to be sent combined with the average throughput obtained by statistics on the UE data sending situation, configures an activation time that is numerically greater than the remaining sending time, and sends it to the target base station and UE;

E. The UE finishes updating the serving cell, and the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell at a time corresponding to the activation time.

Wherein, in the step B, the source base station counts the amount of data to be sent by the UE, which means that the source base station counts the amount of data to be sent saved for the UE in the high-speed media access control entity of the UE.

The method of sending to RNC in step B is to add a parameter representing the amount of data to be sent to the ready message sent by the source base station to RNC.

The average throughput rate is the data rate obtained by users on the air interface through HSDPA.

The present invention can also be realized through the following technical solutions:

a. The RNC sends an update preparation message to the source base station;

b. The source base station counts the amount of data to be sent by the UE, and obtains the remaining sending time according to the amount of data to be sent in combination with the average throughput obtained by statistics on the UE data sending situation, and sends it to the RNC;

c. The RNC stops sending data to the source base station, and notifies the target base station to update the serving cell;

d. The RNC configures the activation time for the source base station to be numerically greater than the remaining sending time, and sends the activation time to the target base station and the UE;

e. The UE finishes updating the serving cell, and the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell at a time corresponding to the activation time.

Wherein, in the step b, the source base station counts the amount of data to be sent by the UE, which means that the source base station counts the amount of data to be sent saved for the UE in the high-speed media access control entity of the UE.

The method of sending to the RNC in the step b is to add a parameter representing the remaining sending time in the ready message sent by the source base station to the RNC.

The average throughput rate is the data rate obtained by users on the air interface through HSDPA.

In the present invention, since the data stored in the MAC_hs entity of the source base station can be delivered to the user in time before the source base station resets the MAC_hs entity and the target base station sends data, the data stored in the MAC_hs entity of the source base station can be delivered to the user in time, thus effectively avoiding the HSDPA user from performing the operation between the base stations. Data loss caused when the serving cell is updated. The RNC configures an activation time that is numerically greater than the remaining sending time to ensure that the remaining data is correctly sent to the user before the serving cell updates the activation time to avoid data loss. Therefore, the present invention can reasonably control the update process of the serving cell and improve the service quality.

Description of drawings

Fig. 1 is a schematic diagram of HSDPA users in a soft handover state and a non-soft handover state.

Fig. 2 is a schematic diagram of a user performing HS-DSCH serving cell update between different base stations.

Fig. 3 is a flow chart of Embodiment 1 of the present invention.

Fig. 4 is a flow chart of Embodiment 2 of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in FIG. 2 , when the serving cell of the HS-DSCH channel is updated, the MAC_hs entity of the source base station also stores certain data waiting to be sent. In order to reduce the loss of these data to be sent when the cell is updated, the serving cell update control method provided by the present invention refers to Figure 3, and specifically includes the following steps:

Step 301: The RNC sends an update preparation message to the source base station, notifying the source base station to count the amount of data to be sent.

Step 302: After receiving the preparation message, the source base station counts the amount of data to be sent stored for the user to be updated in the MAC_hs entity, and sends it to the RNC. The sending method may be to add a parameter representing the amount of data to be sent to the ready message sent by the source base station to the RNC, or the source base station may specially send a message carrying data amount information to the RNC.

Step 303: After the RNC obtains the amount of data to be sent, it stops sending data to the source base station, and notifies the target base station to update the serving cell. After the completion, the target base station sends a ready message to notify the RNC.

Step 304: RNC configures activation time for the source base station and the target base station. The activation time must meet the following condition: the value of the activation time is greater than the remaining sending time for sending the remaining data. In this step, the RNC calculates the UE data sending situation before the serving cell is updated to obtain the average throughput rate (that is, the data rate obtained by the user on the air interface through HSDPA), divides the amount of data to be sent obtained in step 302 by the average throughput rate, Get the remaining sending time. After obtaining the activation time, the RNC sends the activation time to the target base station and UE.

Step 305: UE finishes updating the serving cell, and sends a message to RNC. At the moment corresponding to the activation time, stop receiving data from the source serving cell, and start receiving data from the target serving cell.

Step 306: The serving cell is updated

According to Fig. 4, the present invention can also be finished with following steps:

Step 401: RNC sends an update preparation message to the source base station, notifying the source base station to count the amount of data to be sent.

Step 402: After receiving the preparation message, the source base station counts the amount of data to be sent reserved for the UE in the MAC_hs entity, and counts the data sending status of the UE to obtain an average throughput rate, obtains the remaining sending time, and sends it to the RNC. The sending method may be to add a parameter representing the remaining sending time in the ready message sent by the source base station to the RNC, or the source base station may specially send a message carrying the remaining sending time to the RNC.

Step 403: After receiving the remaining sending time, the RNC stops sending data to the source base station, informs the target base station to update the serving cell, and sends a ready message to notify the RNC after the target base station completes the update.

Step 404: According to the principle that the activation time must be greater than the remaining sending time in value, the RNC configures the activation time for the source base station, and sends the activation time to the target base station and the UE.

Step 405: UE finishes updating the serving cell, and sends a message to RNC. At the moment corresponding to the activation time, the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell.

Step 406: The serving cell is updated.

The difference between the two specific embodiments is that in embodiment 1, the source base station counts the amount of data to be sent, sends it to the RNC, and the RNC calculates the remaining sending time. However, in Embodiment 2, the source base station counts the amount of data to be sent, calculates the remaining sending time by itself, and then sends it to the RNC. Both of them belong to two related technical solutions for realizing the purpose of an invention.

By using the present invention, before the source base station resets the MAC_hs entity and the target base station activates the data, the data stored in the MAC_hs entity of the source base station can be delivered to the user in time, thereby effectively preventing HSDPA users from serving between base stations Data loss caused by cell update. The RNC configures an activation time that is numerically greater than the remaining sending time to ensure that the remaining data is correctly sent to the user before the serving cell updates the activation time to avoid data loss. Therefore, the present invention can reasonably control the update process of the serving cell and improve the service quality.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention.

Claims (6)

1. A serving cell update control method, characterized in that said method comprises the following steps: A. The radio network controller RNC sends an update preparation message to the source base station; B. The source base station counts the amount of data to be sent by the user UE and sends it to the RNC; C. The RNC stops sending data to the source base station, and notifies the target base station to update the serving cell; D. The RNC obtains the remaining sending time based on the amount of data to be sent combined with the average throughput obtained by statistics on the UE data sending situation, configures an activation time that is numerically greater than the remaining sending time, and sends it to the target base station and UE; E. The UE finishes updating the serving cell, and the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell at a time corresponding to the activation time. 2. The serving cell update control method according to claim 1, wherein the amount of data to be sent by the source base station statistics UE in the step B is that the source base station statistics UE's high-speed media access control entity is the UE The amount of saved data to be sent. 3. The serving cell update control method as claimed in claim 1, characterized in that: the method sent to RNC in the step B is to increase a parameter representing the amount of data to be sent in the ready message sent to RNC by the source base station. 4. A serving cell update control method, characterized in that: said method comprises the following steps: a. The RNC sends an update preparation message to the source base station; b. The source base station counts the amount of data to be sent by the UE, and obtains the remaining sending time according to the amount of data to be sent in combination with the average throughput obtained by statistics on the UE data sending situation, and sends it to the RNC; c. The RNC stops sending data to the source base station, and notifies the target base station to update the serving cell; d. The RNC configures an activation time for the source base station that is numerically greater than the remaining sending time, and sends the activation time to the target base station and the UE; e. The UE finishes updating the serving cell, and the RNC stops receiving data from the source serving cell and starts receiving data from the target serving cell at a time corresponding to the activation time. 5. The serving cell update control method according to claim 4, characterized in that: in the step b, the amount of data to be sent by the source base station statistics UE is the UE in the high-speed media access control entity of the source base station statistics UE The amount of saved data to be sent. 6. The serving cell update control method according to claim 4, characterized in that: the method of sending to RNC in the step b is to add a parameter representing the remaining sending time in the ready message sent to RNC by the source base station.

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