CN1798418A - Method for configuring resource of EUDCH in advance - Google Patents

Abstract

A method for preconfiguring EUDCH resources, comprising the steps: SRNC sends a message to Node B, requiring the establishment of a new wireless link; Node B preconfigures EUDCH resources, and notifies SRNC of the resources of preconfigured EUDCH by returning a message; SRNC sends A message is sent to the UE, informing the UE of pre-configured EUDCH resources. Through the present invention, when the link is established, the E-AGCH, E-RNTI, and E-RGCH/E-HICH resources that the cell needs to configure for the UE as the serving cell have been configured, and the resources that the cell needs to configure for the UE as the non-serving cell Configure E-RGCH/E-HICH resources and notify the UE. When the UE selects the serving cell, the UE has saved the E-AGCH channel of the new serving cell and the configuration of the E-RGCH/E-HICH channel. And knowing the new E-RNTI does not need to be obtained from the network side, and the UE can work normally after switching to a new serving cell. When selecting a serving cell based on the network, the network only needs to notify the UE of the identity of the serving radio link, which can reduce the delay caused by signaling.

Description

Method for preconfiguring EUDCH resources

technical field

The invention relates to that in a WCDMA system supporting EUDCH, when establishing a new wireless link, Node B pre-allocates resources used by EUDCH, and notifies users of pre-configured information through SRNC.

Background technique

The third-generation mobile communication systems are all standardizing on providing high-speed, high-quality data packet services. For example: 3GPP is standardizing HSDPA (High Speed Downlink Access) to increase the downlink data rate, while 3GPP2 is standardizing 1xEV-DV (Evolution-Data and Voice). 3GPP continues to enhance the transmission of uplink packet data (EUDCH), so as to improve the capacity and coverage of uplink. Compared with the uplink DCH of Rel99/4/5, EUDCH introduces the HARQ (Hybrid Automatic Retransmission Request) mechanism, and considers using TTI (Transmission TimeInterval) shorter than the uplink DCH of Rel99/4/5, for example, the same as HSDPA 2ms. TTI is defined as the time interval during which a transport channel transmits data to a physical channel.

The HARQ mechanism is introduced into EUDCH, and the Node B controls whether the UE retransmits data. The dotted lines in Figure 1 represent the transmission of data packets. Node B receives the data sent by UE, if it can be decoded correctly, Node B sends ACK to indicate that the UE data has been received correctly, and the next same process (process) can send new data. Correctly received data is sent to RNC, and RNC sorts the data. If Node B does not decode correctly, Node B sends NAK to instruct UE to resend the data in the same process. Node B combines the retransmitted data with the first sent data, and if it can be decoded correctly, Node B sends the correctly decoded data to RNC.

In the SHO (soft handover) state, only one cell can send absolute scheduling commands and relative scheduling commands, and other cells can only send relative scheduling commands. The cell that can send absolute scheduling commands is the serving cell of the UE. The serving cell determines the uplink rate required by the user according to the power status of the UE and the amount of data to be sent. The serving Node B can send absolute scheduling signaling to control the maximum sending rate of the UE. A relative scheduling signaling can be sent to the user to increase or decrease the rate of the user by a predetermined step. For this UE, the serving cell needs to provide an absolute scheduling channel (hereinafter referred to as E-AGCH) for sending absolute scheduling signaling, and a relative scheduling channel (hereinafter referred to as E-RGCH) for sending relative scheduling signaling. Signaling, generally, this E-RGCH is dedicated and used to send three messages, one is to increase the rate, one is to decrease the rate, and one is DTX. The non-serving cell needs to provide E-RGCH. Generally, this E-RGCH is public and used to send two messages. One message is that the non-serving cell is busy, and the other is that the non-serving cell does not mind the increase in user speed. Both the serving cell and the non-serving cell need to send an acknowledgment (ACK/NAK) response to the user. ACK/NAK is sent through an acknowledgment channel (hereinafter referred to as E-HIGH). E-HIGH and E-RGCH use the same spreading code.

The solid line in Figure 1 describes the process of Node B scheduling UE. Let's take Node B1 and Node B2 both having only one cell as an example, that is, Node B1 and Node B2 are equivalent to a cell.

Node B1 is the serving cell of the user, and can send absolute scheduling signaling to the UE through the E-AGCH. The E-AGCH channel may be a shared channel, and absolute scheduling signaling for users is transmitted on the E-AGCH. In order to distinguish different users, it is necessary to assign an identifier to the user, which can uniquely identify the user within the cell range. This identifier is called E-RNTI and is assigned by the Node B where the serving cell is located. The E-AGCH channel may include two parts, one is user identification, and the other is scheduling signaling. Node B1 can also use the E-RGCH channel to send relative scheduling signaling to the UE, and send ACK or NAK instructions through the E-HICH

Node B2 is the user's non-serving cell and cannot send absolute scheduling signaling to the user. Node B2 can send relative scheduling signaling to the UE through the E-RGCH channel. Send ACK or NAK indication through E-HICH.

The serving cell always selects a cell with good uplink or downlink signal quality. When the signal quality of Node B1 deteriorates, and the signal quality of Node B2 becomes better, after reaching a certain level, the serving cell needs to switch from Node B1 to Node B2.

At present, there are two methods to select the serving cell. One is to select by the network. The SRNC selects a cell with good quality as the serving cell according to the measurement report of the UE or Node B. The other one is selected by the UE. The UE determines the serving cell according to the quality of the downlink channel or the number of confirmation responses received within a certain period of time. The UE includes the identity of the new serving cell in the Mac-e PDU. When the UE receives confirmation from the new serving cell and the old serving cell, the UE starts to switch to the control of the new serving cell.

FIG. 2 is a method for selecting a cell based on a user.

In step 201, the UE selects a new serving cell. Include the identity of the new serving cell in the Mac-e PDU and send it to all cells under the SHO.

Step 202, if the new serving cell receives the Mac-e PDU correctly, then the new serving cell sends an acknowledgment message to the UE. Then it starts to dispatch users as the serving cell.

Step 203, if the old serving cell receives the Mac-e PDU correctly, the old serving cell sends an acknowledgment message to the UE. Then stop scheduling the user as the serving cell.

The disadvantage of selecting a cell based on the network is that the delay is relatively long. When switching to a new cell, the network needs to reconfigure the resources used, and the signaling needs to be interacted, resulting in a long delay. Based on the fact that the UE selects a cell to notify the identity of the new serving cell through Mac-e PDU, when the UE receives confirmation messages from the old serving cell and the new serving cell, the process of serving the cell selection ends. In this way, there is no network participation process. If the configuration of the new serving cell is different from that of the old service message, without the participation of the network, the user will not know that the user is in the new serving cell during the switching process of the serving cell. Information of the EUDCH control channel to use.

Contents of the invention

The purpose of the present invention is to solve the problem that the configuration under the new serving cell cannot be obtained in the process of cell selection based on the UE selecting the serving cell by pre-configuring the resources of the EUDCH control channel when the wireless link is established. For the solution of selecting a serving cell based on the network, when the serving cell is switched, only the identity of the new serving cell needs to be notified, which can reduce delay.

In order to achieve the above purpose, a method for preconfiguring EUDCH resources includes steps:

SRNC sends a message to Node B, requesting to establish a new wireless link;

Node B pre-configures EUDCH resources, and notifies SRNC of the pre-configured EUDCH resources through a return message;

The SRNC sends a message to the UE, notifying the UE to pre-configure EUDCH resources.

Through the present invention, when the link is established, the E-AGCH, E-RNTI, and E-RGCH/E-HICH resources that the cell needs to configure for the UE as the serving cell have been configured, and the resources that the cell needs to configure for the UE as the non-serving cell Configure the resources of E-RGCH/E-HICH and notify the UE. When the serving cell is selected based on the UE, the UE has saved the E-AGCH channel of the new serving cell and the configuration of the E-RGCH/E-HICH channel. And knowing the new E-RNTI does not need to be obtained from the network side, and the UE can work normally after handing over to a new serving cell. When selecting a serving cell based on the network, the network only needs to notify the UE of the identity of the serving radio link, which can reduce the delay caused by signaling.

Description of drawings

Figure 1 is the process of data transmission in EUDCH;

FIG. 2 is a UE-based serving cell selection process;

FIG. 3 is a signaling flow of pre-configured resources in the present invention.

Detailed ways

According to the present invention, when establishing a new wireless link, Node B pre-configures certain EUDCH information, and notifies UE of the pre-configured resources through SRNC.

Some information related to EUDCH is the same in the serving cell and the non-serving cell. For example, the EUDCH channel for transmitting data is configured when the wireless link is established. When the UE switches the serving cell, the configuration does not change. The information does not need to be configured in advance. Some resources are allocated differently to the UE as the serving cell and as the non-serving cell. When the UE switches the serving cell, the new serving cell is converted from the UE’s non-serving cell to the UE’s serving cell. Before the handover, the UE uses the resources configured for the UE by the cell as the non-serving cell, and after the handover, the UE uses the resources allocated to the UE by the cell as the serving cell. Therefore, although the cell where the link is located may not be the serving cell of the UE when establishing a new link, it is also necessary to pre-configure resources that must be configured when the cell serves as the serving cell of the UE. If the serving cell is switched when a new link is established, and the cell where the link is located is used as the serving cell of the UE, the resources that need to be configured when this cell is used as the serving cell need to be configured. At the same time, this cell needs to be pre-configured as A resource that must be configured when the UE is not serving a cell. Such information includes E-AGCH, E-RNTI, E-RGCH, and E-HICH.

The E-AGCH channel is public, or shared, and is not specially configured for a certain user. Therefore, when a new wireless link is established for a certain user in a cell, the E-AGCH channel is likely to be It has already been established, and the SRNC has saved the configuration of the E-AGCH of this cell. When the SRNC sends a signaling to the Node B to request the establishment of a wireless link, it can indicate that the information of the E-AGCH is not needed. In this way, the Node B The return message does not need to contain the E-AGCH information, but for the UE, the SRNC needs to notify the UE of the stored E-AGCH information used by the cell. If the SRNC does not save the E-AGCH configuration of this cell, when the SRNC sends a signaling to the NodeB to request the establishment of a wireless link, it indicates that the information of the E-AGCH is needed, and the Node B includes the configuration information of the established E-AGCH in the The SRNC is notified in the return message, and then the SRNC notifies the UE. Only when the user is the first user in this cell, when the SRNC sends signaling to the NodeB to establish a wireless link, the NodeB needs to allocate E-AGCH channel resources, and configure the E-AGCH in the return message Notify the SRNC, and then the SRNC notifies the UE of the configuration information related to the E-AGCH.

The resources of E-RGCH/E-HICH include the used spreading code and the signature allocated to UE. E-RGCH and E-HICH use the same spreading code but different signatures. The number of signatures is limited. Therefore, if a cell is a non-serving cell of the UE, for E-RGCH, the cell must assign a public signature to the user. For E-HICH, both the serving cell and the non-serving cell assign dedicated signatures to users. When a cell changes from a UE's non-serving cell to a UE's serving cell, the cell will allocate a new group of E-RGCH and E-HICH signatures to the UE, and may also allocate a new spreading code. Conversely, when a cell changes from a serving cell to a non-serving cell, the cell needs to allocate a new group of E-RGCH and E-HICH signatures to the UE, and the spreading code may also change.

When the SRNC establishes a new radio link, the cell where the new radio link is located may serve as a UE's serving cell or as a UE's non-serving cell. Therefore, in the pre-configuration method of the present invention, when the SRNC establishes a new wireless link for the user, the Node B needs to allocate two sets of E-RGCH/E-HICH resources to the user. One set is the E-RGCH/E-HICH resource allocated to the UE by the cell where the new wireless link is located as the serving cell of the UE, and the other is the resource allocated to the UE by the cell where the new wireless link is located as the non-serving cell of the UE E-RGCH/E-HICH resources.

Of course, if the protocol specifies that a cell acts as a non-serving cell for the UE, the E-RGCH/E-HICH resources allocated to the UE and the cell acts as the serving cell for the UE allocates the E-RGCH/E-HICH resources for the UE. The resources are the same, so for E-RGCH/E-HICH, a set of E-RGCH/E-HICH resources needs to be configured when establishing a wireless link.

Node B allocates a unique identifier for each EUDCH user: E-RNTI. The E-RNTI is unique in the cell. The serving cell uses the E-RNTI to schedule users on the E-AGCH channel, and the non-serving cell does not use the E-RNTI. In the present invention, E-RNTI also needs to be pre-configured when establishing a wireless link. This identifier is assigned by the Node B and notified to the SRNC in the response message of the wireless link establishment, and then the SRNC notifies the UE through an RRC message.

That is to say, when the RNC establishes a new wireless link for the user, the Node B needs to pre-configure: E-AGCH related information, E-RNTI, and two sets of E-RNTI assigned to the UE by the cell as the serving cell and the non-serving cell respectively. -RGCH/E-HICH related information, and notify the SRNC, and then the SRNC notifies the UE of this information.

Example

Fig. 3 is an embodiment of the present invention. When the RNC establishes a new wireless link, the Node B pre-configures E-AGCH and E-RNTI for the UE, and the cells are used as the relevant resources of the E-RGCH/E-HICH allocated to the UE by the serving cell and the non-serving cell respectively. When selecting a serving cell based on UE, the following procedure is necessary. When selecting a serving cell based on UTRAN, the network can notify the user of the new configuration when the network reselects the serving cell, or use the following procedure to pre-configure E- AGCH, E-RNTI, and E-RGCH/E-HICH related information of the cell as the serving cell and the non-serving cell, so that when the network reselects the serving cell, the signaling used is very simple.

Step 301: the serving cell of the EUDCH user is located in the cell below Node B1, and the controlling RNC and serving RNC of Node B1 are both SRNC in the figure. The SRNC needs to establish a new radio link, and the new radio link is located in a cell under the control of NodeB2. The controlling RNC of NodeB2 is the DRNC in the figure, and the serving RNC is the SRNC in the figure. The SRNC sends a signaling radio link establishment request to the DRNC.

Step 302: After receiving it, the DRNC sends the radio link request signaling to the cells under Node B2.

Step 303: the cell under Node B2 pre-configures resources for EUDCH users, and allocates a unique user identifier E-RNTI within the cell range. If there is no E-AGCH channel established in this cell, Node B needs to establish an E-AGCH channel for this cell. And notify the SRNC in the return message. If the E-AGCH has been established in the cell, and the signaling from the SRNC indicates that E-AGCH information is required, the Node B shall include the E-AGCH information in the return message to notify the SRNC. If the E-AGCH has been established in the cell, and the SRNC has saved the E-AGCH information of this cell, and the signaling sent by the SRNC indicates that the E-AGCH information is not required, the Node B does not need to include the E-AGCH information in the return message. Information from AGCH.

The cell under Node B2 needs to establish two sets of E-RGCH/E-HICH resources for the user. One set is the E-RGCH/E-HICH resource allocated to the UE by this cell as the UE serving cell, and the other set is the The E-RGCH/E-HICH resource allocated to the UE by the cell as a non-serving cell for the UE.

If the agreement stipulates that the UE uses the same E-RGCH/E-HICH channel in the serving cell and the non-serving cell, the cell under Node B2 only needs to configure a set of E-RGCH/E-HICH resources.

Node B2 sends a response message to DRNC, the message contains: E-AGCH channel configuration, E-RNTI, cell as the UE's serving cell and non-serving cell to allocate two sets of E-RGCH/E-HICH information for the UE.

Step 304, DRNC forwards the response message sent from the cell below Node B2 to SRNC, and notifies the SRNC of the resource allocated by the cell below Node B2 for the EUDCH.

In step 305, the SRNC sends an active set update message to the user, and the message includes the configuration of the new radio link. The SRNC also needs to tell the UE the pre-configured resources. This message should include two sets of E-RGCH/E-HICH resources, E-AGCH and E-RNTI, allocated for the user by the cell under Node B2.

In the method of selecting a serving cell based on the network, if at this time, the SRNC determines that the cell under the serving NodeB1 is switched to the cell where the newly added wireless link under Node B2 is located, the RRC message sent by the SRNC also includes the new serving cell logo. The identifier of the new serving cell can be identified by the existing radio link.

In the UE-based method for selecting a serving cell, the UE needs to save pre-configured resources, and when the UE selects a new serving cell, it can obtain required information from the saved information.

The information elements in Table 1 need to be included in the response messages related to wireless link establishment on the Iub and Iur interfaces, specifically, wireless link establishment response, wireless link increase response, wireless link reconfiguration ready, wireless link Link reconfiguration response. When establishing a wireless link, the message sent by SRNC to Node B contains an indication of whether E-AGCH information is needed. According to this indication, Node B decides whether to include E-AGCH information in the response message. Therefore, E-AGCH information is optional for the response message.

The information elements in Table 2 need to be included in the messages related to the establishment of the radio link on the radio interface, such as active set update request message, physical channel configuration request and so on. When the preconfiguration method of the present invention is adopted, the information elements in Table 2 are all mandatory types.

Table 1 Information elements to be included in the message sent by Node B to SRNC information element Presence describe EE-AGCH spreading code o Determine whether to include this information element according to the indication in the message of SRNC->Node B E-RNTI m E-RGCH/E-HICH spreading code as serving cell m EE-RGCHSequence Number as the serving cell m EE-HICHSequence Number as serving cell m EE-RGCH/EE-HICH spreading code as a non-serving cell m EE-RGCHSequence Number as a non-serving cell m EE-HICHSequence Number as a non-serving cell m

Table 2 Information elements to be included in the message sent by SRNC to UE information element Presence describe EE-AGCH spreading code m E-RNTI m E-RGCH/E-HICH spreading code as serving cell m EE-RGCHSequence Number as the serving cell m EE-HICHSequence Number as serving cell m EE-RGCH/EE-HICH spreading code as a non-serving cell m EE-RGCHSequence Number as a non-serving cell m EE-HICHSequence Number as a non-serving cell m

Claims (7)

1. A method for preconfiguring EUDCH resources, comprising steps: SRNC sends a message to Node B, requesting to establish a new wireless link; Node B pre-configures EUDCH resources, and notifies SRNC of the pre-configured EUDCH resources through a return message; The SRNC sends a message to the UE, notifying the UE to pre-configure EUDCH resources. 2. The method according to claim 1, characterized in that said EUDCH pre-configured resources are transmitted on Iub, Iur and air interface. 3. The method according to claim 1, characterized in that said pre-configured EUDCH resources include information related to E-AGCH used by the cell. 4. The method according to claim 1, characterized in that said pre-configured EUDCH resources include E-RNTI allocated by the cell to the UE. 5. The method according to claim 1, wherein said pre-configured EUDCH resources include information related to E-RGCH/E-HICH allocated by a cell. 6. The method according to claim 1, wherein the pre-configured EUDCH information includes two sets of E-RGCH/E-HICH configuration information, which are the E-RGCH allocated to the UE by the cell as the serving cell of the UE /E-HICH resources, and the E-RGCH/E-HICH resources allocated to the UE by the cell as the non-serving cell of the UE. 7. by the described method of claim 1, it is characterized in that the message that SRNC sends to Node B comprises whether to need the indication of E-AGCH information.

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