CN1406008A - Method for raising quick-action small-area-selection performace in course of high-speed down bay switch-in - Google Patents

Abstract

The invention discloses a method for improving the fast cell selection performance in the high-speed downlink packet access process. In the FCS process of HSDPA, the method uses the IP transmission path between the base station and the base station to transmit the PDU sending state synchronization between the cells. and when the new cell enters the active set, the primary cell will directly forward the unconfirmed PDU in the MAC-hs to the new cell from the inter-base station path, and at the same time, the RNC will also send a new PDU to the new cell, through the two-way PDU At the same time, it is issued to accelerate the synchronization process between the new cell and other cells, so that the present invention is conducive to improving the continuity of data transmission in the FCS process, accelerating the process of PDU queue synchronization between the cells in the active set, and accelerating the process of newly entering the active set The data filling process of the cell, and reduce the signaling overhead between RNC and NodeB.

Description

Method for improving fast cell selection performance in high-speed downlink packet access process

technical field

The invention relates to a fast cell selection method in high-speed downlink packet access in a wireless communication system.

Background technique

The FCS (Fast Cell Selection) technology adopted by HSDPA (High Speed Downlink Packet Access) uses distributed PDU (Protocol Data Unit) queues in each cell to replace the existing RNC (Radio Network Controller) centralized PDU queues. During downlink transmission, the RNC sends PDU data to all the cells in the active set at the same time, and then the UE (user equipment) chooses to receive data from a cell with the best performance, while other cells keep the downlink transmission of the UE at pending state. When the primary cell is replaced, that is, when the UE selects another cell to receive data, the current primary cell is suspended, and the selected new cell starts to download data. After receiving the data sent by the primary cell, the UE feeds back an ACK (acknowledgment) information for each TTI (Transmission Time Interval) carrying the data. The primary cell converts the acknowledgment information of these TTIs into acknowledgment information of the PDU carried by the corresponding TTI. Although all the cells in the active set can listen to the ACK signaling sent by the UE through the uplink channel, since the secondary cells do not know which PDUs are encapsulated in the TTI corresponding to the ACK, they cannot interpret this signaling, but can only Know which PDUs have been acknowledged through the primary cell.

In order to ensure that the data transmitted by the old and new cells to the UE is continuous when the primary cell is replaced, all cells in the active set need to keep the PDU transmission status synchronized, that is, although only the primary cell sends data to the UE at each moment and interprets the returned ACK information , but other secondary cells in the active set also need to keep track of the receiving status of the PDU, including being acknowledged, being retransmitted, and other relevant transmission parameters. The above-mentioned synchronization process can usually be controlled by the RNC through the network, which regularly releases PDU reception confirmation information to each secondary cell according to the information reported by the UE or the primary cell. Each secondary cell adjusts its own PDU queue according to this information, so that it is consistent with the state of the PDU queue of the primary cell.

At present, a better method for the RNC to obtain the receiving state of the PDU by the UE is the NodeB (wireless base station of the wideband code division multiple access system) assisted mapping method (NodeB assisted PDU bitmap). In this method, the main cell generates a mapping according to the confirmed status of each PDU in the PDU queue, that is, a bitmap with the length of the PDU queue, each bit in turn represents the confirmation status of a PDU in the PDU queue, and then reports it from the NodeB in the form of a message to the RNC, and the RNC forwards the mapping message to each non-primary cell. Since the mapping message needs to be forwarded by the RNC, the signaling delay through the Iub/Iur (interface between the RNC and the base station/interface between the RNC) interfaces for many times will bring a hysteresis effect on cell synchronization.

For the active set, if a new cell joins, the new cell must first obtain the same PDU queue as the primary cell, and then perform PDU synchronization operations like other cells. Since the PDU data required by the new NodeB is delivered from the RNC, and because the RNC cannot determine the status of the PDU queue in the current primary cell, it must first request an "unconfirmed PDU" information from the primary cell. The RNC then forwards these PDUs via the new cell. Even if the RNC backs up the PDU data delivered to the NodeB in the PDU queue in the RLC (Radio Link Control), it needs to request a "bitmap of unconfirmed PDU" information from the primary cell, and then send the queue from the RLC Find these PDUs in the network and send them to the new cell. From the above process, it can be seen that since the information exchange between cells is forwarded by RNC, the data filling process of the new cell needs to go through more delays. Due to the influence of these delays and transmission levels, HARQ (Hybrid Automatic Repeat Request ), AMC (Adaptive Coding and Modulation) and other lower-layer transmission parameters cannot be transmitted to the new cell through the RNC, which limits the FCS performance of HSDPA.

Contents of the invention

The purpose of the present invention is to provide a method capable of improving the performance of fast cell selection in the process of high-speed downlink packet access.

In order to achieve the above object, the method for improving the fast cell selection performance in the high-speed downlink packet access process provided by the present invention includes:

(1) Establish transmission links between the radio network controller and the base stations belonging to all the cells in the active set, and transmission links between the base stations belonging to the primary cell and all the base stations belonging to the secondary cells;

(2) After the primary cell and the user equipment perform data transmission and receive confirmation feedback, the confirmation status of the PDU (protocol data unit) is transmitted to the secondary cell through the transmission link between the base station to which the primary cell belongs and the base station to which the secondary cell belongs. The cell adjusts the PDU queue of the cell according to the PDU confirmation state, and then completes the PDU state synchronization control between cells;

(3) When a new cell joins the active set, establish the transmission link between the radio network controller and the base station to which the new cell belongs, and the transmission links between the base station to which the primary cell belongs and all the base stations to which the secondary cells belong, and the primary cell passes through the The transmission link between the base station to which the cell belongs and the base station to which the slave cell belongs transmits the unconfirmed PDU to the new cell. The link sends new PDUs to all the cells in the active set, and the new cell can organize the received two-way PDUs from the main cell and the radio network controller into the PDU queue of this cell, and then complete the PDU queue of the new cell and other The synchronization process of the cell PDU queue;

(4) When a cell exits the active set, the transmission link between the radio network controller and the base station to which the cell belongs and the transmission link between the base station to which the primary cell belongs and the base station to which the cell belongs are removed.

The establishment of the transmission link between the base station to which the master cell belongs and the base stations to which all secondary cells belong is an IP (Internet Protocol) link.

The process of transmitting the PDU acknowledgment state to the secondary cell is completed through the PDU queue state synchronization message between the base stations.

The method also includes:

A PDU state synchronization control module is added to the MAC-hs (High Speed Media Access Control) of the cell, so that when the cell belongs to the primary cell, a "PDU confirmation status" message or an "unconfirmed PDU" message is generated and sent to the secondary cell, When the cell to which it belongs is a secondary cell, receive the "PDU Confirmation Status" message from the primary cell, and adjust the PDU queue of the cell according to the message, or receive two-way PDUs from the primary cell and the radio network controller, and Organize them into the PDU queue of the cell.

When the primary cell is replaced, the user equipment sends the identity of the new primary cell to all the cells in the active set. After receiving the identity, the new primary cell starts the suspended downlink, and the original primary cell suspends the downlink after receiving the identity. .

When the primary cell is replaced, the links between all base stations of the secondary cell and the base station of the new primary cell are re-established according to the following method:

(11) The base station belonging to the original primary cell stops sending PDU confirmation status messages to the base station belonging to the original secondary cell and the base station belonging to the new primary cell;

(12) The base station to which the original primary cell belongs assigns a new link identifier for receiving the data transmitted by the new primary cell, together with the link identifiers between it and other base stations to which the secondary cell belongs, pass between it and the base station to which the new primary cell belongs The existing transmission link of the new primary cell is transmitted to the new primary cell, and the new primary cell directly sends new synchronization information to these cells according to these identifiers;

(13) The base station to which the new primary cell belongs releases the link identifier of the link between the original primary cell and the original primary cell.

As can be seen from the technical solution adopted by the present invention above, the difference between the present invention and the existing fast cell selection mechanism is that: 1) a direct IP link is established between the base station to which the primary cell belongs and the base stations to which other cells in the active set belong. Transmission link; when a cell enters the active set, an IP link with the primary cell is established; when the primary cell is replaced or the cell exits the active set, the link is torn down. 2) Add a synchronization control module in each cell. When the cell acts as the primary cell, this module has the functions of "publishing PDU status synchronization information" and "forwarding unconfirmed PDUs". Functions of "PDU state synchronization information" and "dual reception of new cell filling data from the main cell and RNC". 3) Remove the signaling on the Iub interface about RNC requesting "PDU transmission status" from the primary cell and the synchronization signaling about RNC sending "PDU transmission status" to the secondary cell. 4) Change the signaling flow of the FCS procedure.

As can be seen from the above, in the fast cell selection process, the present invention accelerates the process of synchronizing the PDU queues between the cells in the active set, and accelerates the data filling process for the cells newly entering the active set; HARQ and AMC, etc. can be synchronized between the cells Low-layer transmission parameters; make it possible to continue HARQ during primary cell replacement. In a word, the present invention can improve the continuity of PDU transmission in the fast cell selection process, reduce the delay of transmission time and reduce the signaling between the radio network controller and the base station, and simplify the entire fast cell selection process;

Description of drawings

Fig. 1 is a schematic flow sheet of the inventive method;

Fig. 2 is a communication path diagram between entities when PDU states are synchronized between cells in the FCS process;

FIG. 3 is a communication path diagram between entities when new cell data is filled in the FCS process;

Fig. 4 is the receiving process figure of the two-way PDU of PDU state synchronous control module;

Figure 5 is the first state diagram of a specific FCS implementation process;

Fig. 6 is the second state diagram of the FCS implementation process described in Fig. 5;

Fig. 7 is the third state diagram of the FCS implementation process described in Fig. 5;

FIG. 8 is a fourth state diagram of the FCS implementation process described in FIG. 5 .

Detailed ways

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

In the 3GPP standard, IP transmission is introduced in UTRAN (UTMS: Universal Mobile Communication System), and the data flow on the Iub interface is identified by "UDP (User Datagram Protocol) port number + IP address" , that is, identify the data flow on the interface by "destination IP address" and "destination UDP port number". Because after the RAN (Radio Access Network) uses the IP network, each network element is directly hung on the edge router of the IP network. For HSDPA, the direct communication of the user plane between NodeBs uses the HSDPA FP (High Speed Downlink Packet Access Frame agreement) agreement. The "destination UDP port number + destination IP address" of the data stream is allocated by the new NodeB, and is notified by the RNC to the original NodeB through NBAP (Broadband Code Division Multiple Access System Base Station Application Part) signaling. The direct communication of NodeBs based on IP transmission provides a more convenient way for information exchange between NodeBs, and brings new possibilities to solve the problems of inter-cell PDU transmission status synchronization and new cell data filling faced by the above-mentioned HSDPA FCS.

In order to improve the performance of HSDPA FCS, the present invention has adopted following steps: the first step, set up the transmission link between the radio network controller and the base stations belonging to all the cells in the active set, and the links between the base stations belonging to the main cell and all the base stations belonging to the secondary cells transmission link between them.

In the second step, when the primary cell and the user equipment perform data transmission and obtain confirmation feedback, the confirmation status of the PDU (protocol data unit) is transmitted to the secondary cell through the transmission link between the base station to which the primary cell belongs and the base station to which the secondary cell belongs, The slave cell adjusts the PDU queue of the cell according to the PDU acknowledgment state, and then completes the PDU state synchronization control between cells. The above-mentioned transmission of the PDU confirmation state to the secondary cell can be completed through a PDU queue state synchronization message between base stations. Refer to FIG. 2 for this step. As shown in the figure, in the process of inter-cell PDU state synchronization, the RNC is synchronous in sending the PDUs to the NodeB, and the PDU queues received in each cell are the same. After the primary cell has transmitted data with the UE and received ACK feedback, it will mark the confirmed PDUs in its PDU queue, and transmit the PDU confirmation status to other cells through the direct transmission path between NodeBs.

In the third step, when a new cell joins the active set, since there is no transmission link between the radio network controller and the base station to which the new cell belongs and the transmission links between the base station to which the primary cell belongs and all base stations to which the secondary cells belong, the first step is to The transmission link is established, and the primary cell transmits the unconfirmed PDU to the new cell through the transmission link between the base station of the primary cell and the base station of the secondary cell, and at the same time, the radio network controller communicates with the activation center through the radio network controller The transmission link between the base stations of all the cells in the active set sends new PDUs to all the cells in the active set, and the new cell organizes the received two-way PDUs from the primary cell and the radio network controller into the PDU queue of the cell, and then Complete the process of synchronizing the PDU queues of the new cell with the PDU queues of other cells. Refer to Figure 3 for this step. As shown in Figure 3, in the process of new cell data filling, assuming that cell 5 is a cell that newly enters the active set, in order for it to obtain the same PDU queue and status as the primary cell, the primary cell still passes through the path between NodeBs and will not be confirmed yet. The PDUs are transmitted to the new cell. The PDU queue of the new cell composed of the PDU data transmitted directly from the primary cell naturally maintains the synchronization state of the PDU queue of the primary cell, so no additional synchronization information is required. However, when the main cell fills the new cell with data, the RNC can still send new PDUs to all the cells in the active set at the same time. In this way, after the buffer of the new cell is filled, the PDUs in it are actually transmitted by two independent paths: 1) the main cell, along the new transmission path between NodeBs; 2) RNC, along the path between RNC and NodeB the traditional transmission path.

The transmission links described in the second and third steps above are IP (Internet Protocol) links.

In the third step above, when the new cell joins the active set, the process of establishing the transmission link is as follows: Assume that the NodeB to which the primary cell belongs is NodeB-old, and the NodeB to which the new cell belongs is NodeB-new, they all belong to in the same RNC. In this way, 1) when a new cell enters the active set, the link between the RNC and the NodeB to which the new cell belongs is RNC→NodeB-new. 2) A direct link between the primary cell and the NodeB to which the secondary cell belongs, that is, NodeB-old→NodeB-new.

RNC sends a "link establishment request" signaling to NodeB-new, and NodeB-new assigns an identifier to the link between RNC and NodeB-new, and NodeB-new also assigns an identifier to the link between it and NodeB-old ( NodeB-old→NodeB-new) assigns an identity. Then, NodeB-new returns the two identifiers to RNC through the signaling of "link establishment response". So far, the establishment of the downlink link from RNC to NodeB-new is completed. After receiving the "Link Establishment Response" signaling returned by NodeB-new, the RNC sends the link identification assigned by the new NodeB to establish the link between the old and new NodeBs through the "Link Establishment Request" signaling To NodeB-old, NodeB-old then assigns an identifier to the link between NodeB-old and NodeB-new, and establishes a direct transmission link between the two NodeBs.

In order to control the PDU state synchronization between the cells and the filling process of the two-way PDU in the new cell, the present invention also adds a module with "PDU state synchronization control function" to the MAC-hs of the cell. The functions of this module in the main cell are:

1) During the PDU state synchronization process, generate a "PDU Confirmation Status" message and send it to the secondary cell; 2) During the data filling process of the new cell, generate a "PDU not yet confirmed" message and send it to the secondary cell;

The functions of this module in the slave cell are:

1) During the PDU state synchronization process, receive the "PDU Confirmation Status" information sent by the main cell, and adjust the PDU queue of this cell according to this information; The incoming two-way PDU, and organize them into the PDU queue of this cell.

Refer to FIG. 4 for the receiving process of the above-mentioned two-way PDU. As can be seen from Figure 4, for the new cell, the two-way PDUs from the main cell and the RNC may arrive staggeredly, and the dual-way receiving function of the PDU synchronization control module sorts them and sends them to the PDU buffer queue of MAC-hs. In the actual process, since each PDU is inherently ordered, the method of inserting two PDUs into different positions of the PDU queue can be used to quickly realize the sorting between them, that is, a new cell PDU queue is set with a two-way The location boundary mark of the PDU, when the PDUs are received by the dual-channel receiving function one by one, they are respectively inserted at the end of the PDU queue and before the location boundary mark, so that when the PDUs are received, the PDU buffer queue of the MAC-hs is in order, which is consistent with the main The PDU queues of the cells are exactly the same.

Step 4: When a cell exits the active set, the transmission link with the base station to which the cell belongs and the transmission link between the base station to which the main cell belongs and the base station to which the cell belongs are removed. Assume that the NodeB to which the primary cell belongs is NodeB-primary, and the NodeB to which the secondary cell belongs is NodeB-secondary. They all belong to the same RNC. When the secondary cell withdraws from the active set, the RNC will tear down two links: 1) NodeB-secondary and the link between NodeB-primary; 2) the link between NodeB-secondary and RNC.

The dismantling process is as follows: RNC sends a "link release request" signaling to NodeB-secondary, NodeB-secondary releases the link between itself and RNC, and at the same time releases the link between NodeB-secondary and NodeB-primary allocated by it. The road identifier is returned to the RNC through signaling, and the RNC then notifies the NodeB-primary to stop sending the "PDU Confirmation Status" message to the NodeB-secondary to maintain synchronization.

In the method of the present invention, when the replacement of the primary cell is required, the UE sends the identification of the selected new primary cell to all the cells in the active set, and each cell listens to the identification, and if it finds that the selected cell is itself, then Start the suspended downlink and start transmitting PDU data as the primary cell. The downlink of the original primary cell is changed to a suspended state. Since the PDU queues in each cell maintain a synchronized state, the replacement of the primary cell has no impact on the transmitted PDU content, and the UE still receives a continuous PDU data stream.

When the aforementioned primary cell is replaced, all links between the secondary cells and the new primary cell need to be re-established. Assume that the NodeB to which the primary cell belongs before the replacement is NodeB-old, the NodeB to which the new primary cell belongs to after replacement is NodeB-new, and there are other NodeB-others to which the secondary cells belong, and they all belong to the same RNC. First, NodeB-old stops sending "PDU Confirmation Status" messages to NodeB-other and NodeB-new to keep in sync. Then, allocate a new link ID for the information it is about to receive from NodeB-new, and then pass it to NodeB-new together with the link ID between NodeB-other and NodeB-new to receive these link IDs After that, release its original link identification with NodeB-old, and then start to send the “PDU Confirmation Status” message to all secondary cells to maintain synchronization.

The method for improving HSDPAFCS performance based on NodeB direct communication and dual-path PDU delivery in the present invention is not only applicable to cell active sets within the same RNC, but also applicable to cell active sets covering different RNCs. For the cells under the control of different RNCs, the direct communication between NodeBs brings greater gain in transmission efficiency. Moreover, the double-path PDU filling function can make the unconfirmed PDU of the main cell directly reach the new cell without going through such a long path of "NodeB→RNC→RNC→NodeB". Moreover, the synchronization of transmission parameters of HARQ and AMC between cells is not affected by internal or inter-RNC, which makes the versatility of the present invention more obvious.

Below is a concrete example of the present invention:

Refer to Figure 5. Assume that in the current FCS process, there is a cell A (belonging to NodeB-1) in the active set, and another cell B (belonging to NodeB-2) is entering the active set. At this moment, the link between RNC and NodeB-1 is PATH-0, and the identification of its transmission bearer is: destination UDP port number (UDP port number 1), destination IP address (NodeB-1 IP address).

Assume that the RLC PDU queue status of the RNC is as shown in Figure 6 at this time, in which the PDUs with serial numbers 0 to 999 have been sent to NodeB-1, and the PDUs with serial numbers after 1000 are in the sending window but have not yet arrived. PDU delivered to NodeB-1.

Assume further that the PDU queue status in the MAC-hs buffer of the primary cell at this time is shown in Figure 7, where the first 600 PDUs have been sent to the UE, and ACK information indicating successful reception has been received from the UE. The last 400 PDUs have not yet been acknowledged.

After the new cell B enters the active set, the RNC immediately establishes a new link with NodeB-2: PATH-1, and the identification of its transmission bearer is: destination UDP port number (UDP port number 2), destination IP address (NodeB-2) 2 IP address). At the same time, NodeB-1 also establishes a direct transmission link between them with NodeB-2: PATH-2, and the identification of its transmission bearer is: destination UDP port number (UDP port number 3), destination IP address (NodeB-2 IP address).

After the transmission link with the new cell is successfully established, the primary cell A and the RNC simultaneously fill the cache of the new cell B with PDU data. The primary cell A encapsulates the PDU data No. 600-999 in the queue in the HSDPA FP frame and transmits it to the cell B through the "transmit unconfirmed PDU" function of its "PDU synchronization control function"; during this process, the RNC may also send Cell A and cell B synchronously deliver new PDUs in the window, that is, PDUs with sequence numbers ranging from 1000 to 1499.

Cell B receives the PDU data carried by HSDPA-FP from PATH-1 and PATH-2 through the "dual-path receiving function" of its "PDU synchronization control function". Assuming that the two-way PDU demarcation mark in its buffer queue refers to the position of 100, then it inserts the PDU received from PATH-1 into the tail of the MAC-hs PDU queue, and inserts the PDU received from PATH-2 into the queue After the cell B data is filled between the 99th PDU and the 100th PDU, it is completely synchronized with the PDU queue status of cell A.

In the following process, cell A continues to transmit data to the UE as the primary cell. After a certain time interval, its PDU queue status changes, such as: the 600-700 and 710-750 paragraphs in the above figure The PDU has been successfully acknowledged by the UE, refer to Figure 8. At this time, it needs to be able to issue "PDU confirmation status synchronization information" to cell B through PATH-2. This information includes a bitmap (bitmap), with a total of (750-600+1) bits, of which the value of the 102nd to 109th bits is 0 , and the value of the other bits is 1.

The cell receives the synchronization information from PATH-2, and puts an acknowledgment mark on the corresponding PDU in its PDU queue, and at this time, the PDU queues of the two cells maintain synchronization again.

Assuming that as the UE moves at this time, it wishes to replace the primary cell with cell B, then it sends an uplink signaling containing the identity of cell B. This message is received by cell A and cell B simultaneously. Cell A finds that its identity is different from the cell identity selected by the UE, that is, it stops sending data to the UE; at the same time, when cell B finds itself selected, it transmits unacknowledged PDUs from the head of its PDU queue. In this example, the PDUs with sequence numbers ranging from 701 to 709 and greater than 750 are used. During this process, the PDU data received by the UE is continuous and smooth.

Claims (8)

1, a kind of fast cell that improves in the high-speed downstream bag access procedure is selected the method for performance, comprising:

(1) set up the transmission link between the base station under all sub-districts in radio network controller and the Active Set, and base station and all transmission links between the base station under the sub-district under the main plot;

(2) after main plot and subscriber equipment carry out transfer of data and obtain confirming feedback, with PDU (protocol Data Unit) affirmation state by base station under the described main plot and under the sub-district transmission link between the base station be sent to from the sub-district, adjust the PDU formation of this sub-district from the sub-district according to described PDU affirmation state, and then finish the PDU state synchronized control of minizone;

(3) when new sub-district adds Active Set, set up base station under transmission link between the base station under radio network controller and the new sub-district and the main plot and all transmission links between the base station under the sub-district, the main plot by base station under the described main plot and under the sub-district transmission link between the base station unacknowledged PDU is sent to new sub-district, meanwhile, radio network controller still issues new PDU by all sub-districts in Active Set of the transmission link between the base station under all sub-districts in radio network controller and the Active Set as usual, the two-way PDU that new sub-district can be transmitted the main plot that receives and radio network controller is organized in the PDU formation of this sub-district, and then finishes the synchronizing process of PDU formation of new sub-district and the PDU formation of other sub-district;

(4) when Active Set is withdrawed from the sub-district, remove the transmission link between the base station under radio network controller and this sub-district and and the main plot under transmission link between the affiliated base station in base station and this sub-district.

2, the fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, and it is characterized in that: described transmission link is IP (IP) link.

3, the fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, and it is characterized in that: described PDU affirmation state is sent to from the process of sub-district is to finish by the PDU quene state synchronization message between the base station.

4, fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, it is characterized in that this method also comprises: in the MAC-hs of sub-district (high speed media access control), add PDU state synchronized control module, make when affiliated subdistrict is the main plot, generate " PDU determines state " message or " still unacknowledged PDU " message to sending from the sub-district, when affiliated subdistrict is during from the sub-district, receive " PDU confirms state " message that the main plot is transmitted, and adjust the PDU formation of this sub-district according to this message, perhaps receive the two-way PDU that transmits from main plot and radio network controller, and they are organized in the PDU formation of this sub-district.

5, the fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, it is characterized in that this method also comprises: when needs carry out the main plot replacement, subscriber equipment sends the sign of new main plot by up signaling all sub-districts in Active Set, new main plot receives that the sign back starts the down link that is suspended, and former main plot after receiving sign is hung up down link.

6, improve the method for the fast cell selection performance in the high-speed downstream bag access procedure according to claim 1 or 5, it is characterized in that this method also comprises: when carrying out the main plot when substituting, rebulid all links between the base station under base station and the new main plot under the sub-district according to following method:

(11) under the former main plot base station stop to former under the sub-district under base station and the new main plot base station send PDU and confirm status message;

(12) affiliated new being used to of base station assigns in former main plot receives the chain line of data that new main plot passes, together with itself and other under the sub-district chain line between the base station send new main plot to by the existing transmission link between the base station under it and the new main plot, new main plot directly sends new synchronizing information to these sub-districts according to these signs;

(13) base station discharges the chain line of link between its original and former main plot under the new main plot.

7, the fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, it is characterized in that: set up transmission link in the described step (3) and realize as follows:

(21) radio network controller base station under new sub-district sends request for building link, the base station is radio network controller and the sign of the link assignment between it 1 under the new sub-district, and be base station and the sign of the link assignment between it 2 under the main plot, and give radio network controller these link identification feedback;

(22) radio network controller is set up itself and the downlink transfer link of new sub-district according to the chain line 1 of base station assigns under the new sub-district, simultaneously, the chain line 2 of base station assigns under the new sub-district is sent to base station under the main plot;

(23) under the main plot base station for its with new sub-district under the direct transmission link of base station distribute new chain line, and send the link establishment response that comprises above-mentioned sign to radio network controller, and then finish its with affiliated base station, new sub-district between the foundation of transmission link.

8, the fast cell in the raising high-speed downstream bag access procedure according to claim 1 is selected the method for performance, and it is characterized in that: described step (4) realizes as follows:

(31) radio network controller sends link to the base station under the sub-district of withdrawing from Active Set and discharges request;

(32) base station discharges transmission link between itself and the radio network controller under the sub-district, chain line under that will distribute to oneself the simultaneously and main plot between the base station returns to radio network controller, and the base station stops to send PDU state confirmation message to this base station under the sub-district under the radio network controller notice main plot.

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