CN100387089C

CN100387089C - Method for regulating high speed down block cut-in network coverage

Info

Publication number: CN100387089C
Application number: CNB2005101008919A
Authority: CN
Inventors: 张腾
Original assignee: Huawei Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2008-05-07
Anticipated expiration: 2025-10-28
Also published as: CN1859704A

Abstract

The present invention relates to a third generation of mobile communication technique, which discloses a method for regulating the coverage of a high-speed downlink grouping access network. The method comprises: when a user is moved to a subzone which does not support high-speed downlink grouping access from a subzone which supports the high-speed downlink grouping access to generate channel switching, the switching frequencies are counted by a radio network controller; an operator adjusts the coverage of the high-speed downlink grouping access network according to the switching frequencies. The method can cause the operator to find problems existing in the coverage of the HSDPA network in time, and the service quality of a data service user is ensured by adjusting the network coverage. The method is realized simply, only the radio network controller RNC needs to provide original performance statistics data, an operation and maintenance unit O&M provides relative data enquiry and statistical functions, and the networking and operating cost burden of the operator is not increased.

Description

Method for adjusting high-speed downlink packet access network coverage

Technical Field

The invention relates to a third generation mobile communication technology, in particular to a method for adjusting the coverage of a high-speed downlink packet access (HSDPA) network.

Background

An HSDPA (High Speed Downlink packet Access) technology is introduced into a 3GPP R5 protocol, which is a modulation and demodulation algorithm provided for meeting the requirement of asymmetry of uplink/downlink data service, and can improve the service rate of downlink data under the condition of not changing the constructed WCDMA network structure; using the HSDPA technology, a network can provide a downlink rate of up to 14.4Mbps to a user, which is a very important technology in third generation mobile communication WCDMA, and an operator provides a high-speed data service to the user through the HSDPA technology, establishing a competitive advantage of 3G over 2G and 2.5G.

However, when an operator builds a 3G network, the policy is to build the 3G network in a place where 3G service needs (for example, a large city with developed economy), and in the 3G network coverage, it is selected to use HSDPA technology coverage in a place where data service needs are particularly high (for example, an office building, etc.) to balance different user needs and network building costs.

As shown in fig. 1, a hybrid network of HSDPA coverage and non-HSDPA coverage is shown, where a cell1, a cell2, and a cell3 are 3G cells supporting HSDPA, and cells 4 to 9 are 3G cells not supporting HSDPA.

If the network establishment strategy is based on the above, the operator will face such a network optimization problem: that is, when the 3G service is more and more mature, more and more users will use the high speed data service, and the operator needs to expand the network coverage of the HSDPA in time to ensure the data service quality of the user. At this time, the operator will face the following problems: one, when to adjust the network coverage for HSDPA? Two, how to make adjustments, i.e. to which cells the HSDPA coverage needs to be extended?

In order to solve the above problems, no method for adjusting the coverage of the HSDPA network exists in the prior art.

Disclosure of Invention

In view of the above, the present invention provides a method for adjusting HSDPA network coverage to solve the problem that when there are more users using high speed data service, the HSDPA network coverage needs to be enlarged in time to ensure the quality of service of the user data service.

To achieve the above object, the present invention mainly guides an operator to adjust network coverage of HSDPA by counting the number of times that an HSDPA user has to perform a channel type handover due to moving to a cell that does not support HSDPA.

The invention provides a method for adjusting the coverage of a high-speed downlink packet access network, which is realized by the following technical scheme and comprises the following steps:

when a user moves from a cell supporting high-speed downlink packet access to a cell not supporting high-speed downlink packet access and channel switching occurs, a wireless network controller reports switching information containing switching times to an operation and maintenance unit;

the operator obtains the switching times from the switching information reported to the operation and maintenance unit by the wireless network controller, and adjusts the coverage of the high-speed downlink packet access network according to the switching times.

Wherein,

when the user moves from the cell supporting the high speed downlink packet access to the cell not supporting the high speed downlink packet access as the same frequency adjacent region, the wireless network controller executes the channel soft switch to reconfigure the high speed downlink packet access service into the dedicated channel service.

When the user moves from the cell supporting the high speed downlink packet access to the cell not supporting the high speed downlink packet access as the pilot frequency adjacent region, the wireless network controller executes channel hard switching to reconfigure the high speed downlink packet access service into a dedicated channel service.

The switching information also comprises a switching source cell, a switching target cell and a switching reason.

And after the switching times reach a certain value set by an operator, adjusting the network coverage of the high-speed downlink packet access.

The invention provides an effective method for guiding the coverage optimization of the HSDPA network for an operator by utilizing the characteristic that channel switching has to occur when a user moves from a cell supporting high-speed downlink packet access to a cell not supporting the high-speed downlink packet access and counting the channel switching times through a Radio Network Controller (RNC), so that the operator can find the problems existing in the coverage of the HSDPA network in time and the service quality of a data service user is ensured by adjusting the network coverage. The scheme is simple to realize, only the RNC provides original performance statistical data, and the operation and maintenance unit O & M provides related data query and statistical functions, and does not additionally increase network establishment and operation cost burden of operators.

Drawings

Fig. 1 is a schematic diagram of HSDPA network coverage in WCDMA;

FIG. 2 is a flow chart of an embodiment of the present invention;

fig. 3 is a flow chart of a soft handover resulting in a HSDPA channel handover;

fig. 4 is a flow chart of inter-frequency hard handover resulting in HSDPA channel handover.

Detailed Description

The scheme of the invention is further explained in the following with the attached drawings.

FIG. 2 shows a flow chart of the present invention:

the method comprises the following steps: and a user terminal (UE) is accessed in a cell supporting the HSDPA and establishes the HSDPA service.

The UE can establish the HSDPA service when accessing in a cell supporting the HSDPA according to the user agreement signed with the operator.

Step two: the UE moves to a cell which does not support HSDPA and channel switching occurs.

Because an operator does not adopt the HSDPA technology to cover all 3G networks in order to balance different user requirements and network construction costs when constructing a 3G network, when a UE moves from a cell supporting HSDPA to a cell not supporting HSDPA (usually, a co-frequency neighboring cell or a co-frequency neighboring cell), channel switching is required to reconfigure an HSDPA service to a DCH service.

When UE moves to the adjacent region with the same frequency which does not support HSDPA, RNC executes soft switching to reconfigure HSDPA service to DCH service. As shown in fig. 3, it is assumed that a user accesses a cell (e.g., cell3 in fig. 1) supporting HSDPA and establishes HSDPA service, and then the user moves to a cell (e.g., cell4 in fig. 1, it is assumed that cell4 and cell3 are neighboring cells of the same frequency) that does not support HSDPA. When the signal quality of the cell4 is continuously enhanced and meets the same-frequency event 1A (the 1A event indicates that the cell can be added into the active set), the cell4 will be added into the active set through the soft handover radio link addition process. Meanwhile, as the user moves to the cell4, the quality of the cell3 gets worse, and when the cell3 meets the same-frequency event 1B (1B event, which indicates that the cell needs to be deleted from the active set), the RNC deletes the cell3 from the active set. At this time, only the cell4 is left in the active set, and the cell4 does not support HSDPA, so the RNC needs to perform a channel switching process before deleting the cell3, reconfigure the service from HSDPA to DCH service, and delete the cell3 from the active set after the reconfiguration is completed.

When UE moves to the adjacent area of different frequency which does not support HSDPA, RNC executes hard switching to reconfigure HSDPA service to DCH service. As shown in fig. 4, it is assumed that a user accesses a cell (e.g., cell3 in fig. 1) supporting HSDPA and establishes HSDPA service, and then the user moves to a cell 6 not supporting HSDPA (it is assumed that cell 6 and cell3 are inter-frequency neighbors). When the quality of the cell3 is reduced to a certain degree, the RNC starts the compression mode of the UE through the UU interface process and issues the pilot frequency measurement control to the UE. When the UE measures the signal of the cell 6 and meets the triggering condition, the UE reports the pilot frequency measurement report to the RNC, and the RNC initiates pilot frequency hard switching. Since cell 6 does not support HSDPA, the RNC reconfigures HSDPA to DCH traffic while performing hard handover.

Step three: and the RNC reports switching information containing the switching times to the O & M.

When the RNC executes channel switching, the times of channel switching are automatically counted. When a user moves from a cell supporting HSDPA to a cell not supporting HSDPA and channel switching occurs each time, the RNC automatically counts the switching times and reports switching information such as the switching times, a switching source cell, a switching target cell, switching reasons and the like to the O & M. For the present invention, in the reported handover information, the handover source cell is a cell supporting HSDPA, and the handover destination cell is a cell not supporting HSDPA, and the reason for the handover is that the user moves from the cell supporting HSDPA to the cell not supporting HSDPA, and the number of handovers reported by the RNC is only the number of channel handovers performed when HSDPA is reconfigured to DCH.

Step four: the operator obtains the switching information from the O & M and adjusts the HSDPA network coverage according to the switching times.

The O & M may provide a function of inquiring handover information, and the operator may obtain the handover information from the O & M, and may analyze whether it is necessary to adjust network coverage of the HSDPA according to information of the number of times of channel handover occurring when the user moves from a cell supporting the HSDPA to a cell not supporting the HSDPA. Usually, an operator may set itself to consider whether to adjust the network coverage of the HSDPA when the number of handovers reaches a certain value, and bring a cell that does not support the HSDPA into the coverage of the HSDPA.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for adjusting high speed downlink packet access network coverage is characterized by comprising the following steps:

A. when a user moves from a cell supporting high-speed downlink packet access to a cell not supporting high-speed downlink packet access and channel switching occurs, a wireless network controller reports switching information containing switching times to an operation and maintenance unit; B. the operator obtains the switching times from the switching information reported to the operation and maintenance unit by the wireless network controller, and adjusts the coverage of the high-speed downlink packet access network according to the switching times.

2. The method of adjusting high speed downlink packet access network coverage according to claim 1, wherein step a further comprises the steps of:

a1, when the user moves from the cell supporting high speed downlink packet access to the cell not supporting high speed downlink packet access as the same frequency adjacent region, the wireless network controller executes soft switch to reconfigure the high speed downlink packet access service to the dedicated channel service.

3. The method of adjusting high speed downlink packet access network coverage according to claim 1, wherein step a further comprises the steps of:

a2, when the user moves from the cell supporting high speed downlink packet access to the cell not supporting high speed downlink packet access as the inter-frequency adjacent region, the wireless network controller executes hard switching to reconfigure the high speed downlink packet access service into the dedicated channel service.

4. The method of adjusting high speed downlink packet access network coverage according to claim 1, 2 or 3, wherein the handover information further includes a handover source cell, a handover destination cell and a handover reason.

5. The method for adjusting high speed downlink packet access network coverage according to claim 1, 2 or 3, wherein the step B further comprises: