WO2011144045A2

WO2011144045A2 - Method and device for resources multiplexing, method and device for handover

Info

Publication number: WO2011144045A2
Application number: PCT/CN2011/074346
Authority: WO
Inventors: 邓爱林; 徐斌斌; 任远
Original assignee: 华为技术有限公司
Priority date: 2011-05-19
Filing date: 2011-05-19
Publication date: 2011-11-24
Also published as: JP5745166B2; WO2011144045A3; JP2014515566A; CN102204313B; CN102204313A

Abstract

The present invention provides a method and device for resources multiplexing, and a method and device for handover. The method for resources multiplexing includes that multiplexing Pseudo-Noise codes including Pseudo-Noise codes and a bias are distributed to each cell (201); a neighboring cell list is configured for the cell by the multiplexing Pseudo-Noise codes (202). The present invention can save Pseudo-Noise code resources, reduce the pressure of the neighboring plan, and be applied in indoor coverage systems, such as Micro-cell, pico base station, Femto base station, and so on.

Description

Resource multiplexing method and device, switching method and device

The present invention relates to the field of communications technologies, and in particular, to a resource multiplexing method and apparatus, a switching method, and an apparatus. Background technique

In the early stage of network construction of mobile communication networks, due to the small number of users, macro cells are generally used.

The network structure of (Macro Ce l l ) is covered, and the coverage radius of the macro cell is generally 1 km to tens of kilometers. As the number of network users increases, the capacity of macro cells cannot meet the traffic demand. In order to compensate for the insufficient capacity of the macro cell, micro-cells (Micro-Cell) or pico-cells (Pico-Cel) are generally used for coverage in hotspot areas. In order to improve the quality of indoor coverage, indoor coverage is also covered by microcells or picocells. As shown in FIG. 1 , cell A is a macro cell, and cells B, C, D, and E are micro cells; and the base station controller allocates scrambling codes for cells A, B, C, D, and E (Pseudo-Noi se code). , PN code for short) X, Y, Ζ, U, V; The base station controller is configured with a neighbor list, and the neighbor list of the cell A is configured with cells B, C, D, E adjacent to the cell A. The protocol has restrictions on the number of neighboring cells (the general agreement stipulates that IS-95 mobile phones support 20 neighboring cells, and IS-2000 supports 40 neighboring cells); the base station controller also configures neighboring cells for cells B, C, D, and E. List.

In areas where communication is busy (such as the Xidan area in Beijing), each building is equipped with a cellular system to form a microcell. As a result, the neighbor list is more and more inflated. When the neighbor relationship to be planned exceeds the number of neighbors specified in the protocol, the neighbor relationship of some cells cannot be added to the neighbor list, causing the handover failure. At the same time, each micro cell is assigned a PN code, but the PN code resources are limited (512) and cannot be allocated without limit. Summary of the invention

An embodiment of the present invention provides a resource multiplexing method and apparatus, a switching method, and an apparatus. To achieve the above object, an embodiment of the present invention uses the following technical solutions:

A resource reuse method, including: A multiplexing scrambling code is allocated for each cell, the multiplexing scrambling code includes a scrambling code and an offset; and the neighboring cell list is configured for the cell by using the multiplexing scrambling code.

A resource multiplexing device includes:

a multiplexing scrambling code allocation module, configured to allocate a multiplexing scrambling code for each cell, where the multiplexing scrambling code includes a scrambling code and an offset;

The neighbor list configuration module is configured to configure a neighbor list for the cell by using the multiplexing scrambling code. The prior art uses the PN code to distinguish different cells A and B. For example, the cellular small A and B can respectively allocate the PN codes X and Y, and occupy two scrambling codes. The embodiment of the present invention uses the multiplexing scrambling code to distinguish different cells. B, for example, the cell A assigns a multiplexing scrambling code to: X minus offset; assigns a multiplexing scrambling code to cell B as: X plus offset. Cell and B use the same scrambling code, which saves scrambling resources and reduces the planning pressure of neighbors.

The offset can be set according to the specific situation, and the offset increase and offset reduction of different cells can be different.

A switching method includes:

The terminal moves from the source cell to the target cell;

Searching for the pilot signal of the target cell;

When the pilot signal quality is greater than the handover threshold, the multiplexed scrambling code phase of the destination cell is sent; and the handover indication message sent by the base station controller is received.

A switching method includes:

Receiving a multiplexed scrambling code phase of the destination cell;

Correcting the multiplexed scrambling code phase to obtain a modified multiplexed scrambling code phase;

Determining whether the modified multiplexed scrambling code phase is in the scrambling code identification interval of the destination cell; if the modified multiplexed scrambling code phase is in the scrambling code identification interval of the destination cell, transmitting a handover indication message to the terminal.

A switching device includes:

a receiving module, configured to receive a multiplexed scrambling code phase of the destination cell;

a correction module, configured to correct the multiplexed scrambling code phase, and obtain a modified multiplexed scrambling code phase; An identifying module, configured to determine whether the modified multiplexed scrambling code phase is in a scrambling code identification interval of the destination cell;

And a sending module, if the output of the identifying module is: modifying the scrambling code phase in the scrambling code identification interval of the destination cell, the sending module is configured to send a handover indication message to the terminal.

In the embodiment of the present invention, the multiplexed scrambling code phase is corrected and then identified, and the recognition error is reduced; the switching indication is sent according to the identification result, and the handover success rate is improved. DRAWINGS

1 is a schematic diagram of a distribution of a cell according to an embodiment of the present invention;

2 is a flowchart of a resource multiplexing method according to an embodiment of the present invention;

3 is a schematic structural diagram of a resource multiplexing device according to an embodiment of the present invention;

4 is a flowchart of a handover method according to an embodiment of the present invention;

5 is a schematic diagram of an identification interval of a part of a cell according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a switching device according to an embodiment of the present invention. detailed description

In order to save the scrambling resources and reduce the neighboring area planning pressure, the embodiment of the present invention provides a resource reuse method. As shown in Figure 2, the method includes:

201. Assign a multiplexing scrambling code to each cell, where the multiplexing scrambling code includes a scrambling code and a bias. In the IS-95A CDMA system, the period of the PN code is 32768 chips, every 64 chip. By dividing, 512 (= 32768 / 64) PN codes of different phases are obtained.

Each cell is assigned a PN code. As shown in Figure 1, the cells, B, C, D, and E occupy five scrambling codes X, Y, Z, U, and V.

The multiplexed scrambling code includes a scrambling code and an offset, and the offset may be 1, 2, 3... chips, and different cell offset increments and offset reductions may be different, and the offset may be set according to specific conditions. As shown in FIG. 1, the multiplexed scrambling code Y+lchi p is allocated to the cell B; the multiplexed scrambling code Y1 chip is allocated to the cell C; the multiplexed scrambling code Y+3chip is allocated to the cell D; and the cell E is allocated. Multiplexed code Y_3chip. 202. Configure a neighbor list for the cell by using the multiplexing scrambling code.

The neighboring list configuration principle: a. The directly adjacent cells in the geographical location generally need to be neighbors; b. The neighboring areas generally require mutual neighboring areas, that is, the carrier frequency of the A cell uses B as the neighboring area, and B also needs to A is a neighboring area; c. For dense urban areas, because the station spacing is relatively close (0.5 to 1.5 km), the neighboring area should do more. The PN code resources are limited (512) and cannot be allocated without restrictions.

By using the multiplexed scrambling code to configure the neighbor list for the cell, it satisfies the requirement that the neighboring area should do more and save the PN code resource.

It can be seen from step 201 that the cells ^ C, D, E occupy only one scrambling code, but can represent four cells in the neighbor list.

The technical solution of the present invention is also applicable to a macro cell, a micro cell, and a pico cell at the same time. In order to ensure that the terminal can search all the cells B, C, D, and E using the scrambling code Y, the resource multiplexing method further includes: a step of configuring a search window parameter.

The search window parameters should be configured reasonably. The parameters cannot be configured too large or configured too small; the parameters are configured too large. If the parameter configuration is too large, some extraneous signals will also fall within the search window, affecting the link quality. The larger search window will also make the mobile phone search for adjacent pilots slower; the parameters are configured too small. The useful set of the active set signals will fall outside the search window. The active set signals that are missing outside the window may become interference, which may seriously affect the link quality. The embodiment of the present invention configures the search window parameters to two. Chip.

The embodiment of the present invention further provides a resource multiplexing device. As shown in FIG. 3, the device includes: a multiplexing scrambling code allocation module 301, configured to allocate a multiplexing scrambling code for each cell, and the multiplexing interference The code includes a scrambling code and an offset;

The neighbor list configuration module 302 is configured to configure a neighbor list for the cell by using the multiplexing scrambling code.

The cell includes a macro cell, a micro cell, and a pico cell; the offset is 1 chip.

The resource multiplexing device of the embodiment of the present invention further includes: a parameter configuration module, configured to configure a search window parameter; and the embodiment of the present invention configures the search window parameter as two chips. The resource multiplexing method of the embodiment of the invention saves the scrambling code resources and reduces the planning pressure of the neighboring area.

The embodiment of the invention further provides a handover method. The application scenario of the method: The terminal moves from the source cell to the target cell, and sends the multiplexed scrambling code phase of the destination cell to the base station controller. As shown in FIG. 4, the switching method includes the following steps:

401. Receive a multiplexed scrambling code phase of a destination cell.

The base station controller receives the multiplexed scrambling code phase of the cell D, PNpha se = PN Y*64 + 3- _m ;

402. Correct the phase of the multiplexed scrambling code to obtain a modified multiplexed scrambling code phase.

The base station controller corrects the multiplexed scrambling code phase according to the transmission delay of the cell A, and obtains the modified multiplexed scrambling code phase PNpha s e = PN Y*64 +3;

4 The process is as follows:

The clocks of the cells A and D are referenced to the system time (ie, GPS GPS); the clock of the terminal is related to the transmission delay of the cell in which it is located; in the present invention, the terminal is from cell A. Switch to Cell D; Cell A provides service to the terminal before the handover is completed, assuming m is the transmission delay of the signal within Cell A.

If the cell D transmits the multiplexed PN code at 10:00 in the morning, the transmission arrives at the terminal through the cell A; it is assumed that the transmission delay m of the signal in the cell A is 10 minutes, and at this time, the time of the terminal is 10:10. According to the transmission delay, the terminal determines that the time for the cell D to transmit the multiplexed PN code is 10:10:10:10, and the phase of the multiplexed PN code of the destination cell is determined as: PNpha se = PN Y*64

+ 3—m;

The terminal transmits the multiplexed scrambling code phase to the cell D. Assuming that the transmission delay _n of the signal in the cell A is 3 minutes, the base station controller determines that the multiplexed PN code phase is: PNpha se = PN Y*64 + 3- m +n where, when the destination cell is a cell or a micro cell, since the distance from the cell or the micro cell to the terminal is very close, n can be ignored.

The base station controller corrects and restores the phase of the multiplexed PN code, and the PNphase plus the transmission delay m in the cell A is multiplexed with the 4th code phase PN Υ*64 + 3+η, since the handover has not been completed, the terminal There is no communication channel established with the mobile phone, so η cannot be corrected.

403. Determine whether the modified multiplexed scrambling code phase is in a scrambling code identification interval of the destination cell. Both the base station and the mobile phone have a same neighbor list, and the neighbor list lists adjacent cells, and each cell corresponds to an identification interval. The starting end point of the scrambling code identification interval of the destination cell is the multiplex scrambling code of the destination cell minus W chips, and the terminating end point is the multiplexing scrambling code of the destination cell plus Z chips, where W and Z are Natural number. The values of W and Z may be the same or different.

Cell B's scrambling code identification interval (PN Υ, ΡΝ Υ + 2 ); Cell C's scrambling code identification interval ( ΡΝ Υ, ΡΝ Υ 2 ); Cell! Scrambling code recognition interval ( ΡΝ Υ+2 , PN Υ+ 4 ); the scrambling code identification interval of the cell ΡΝ (ΡΝ Υ-2, ΡΝ Υ - 4 ) „

The base station controller identifies which scrambling code identification interval the multiplexed scrambling code phase PNphase = PN Y*64 +3 _+n falls in;

404. If the modified multiplexed scrambling code phase is in a scrambling code identification interval of the destination cell, send a handover indication message to the terminal.

If the multiplexed scrambling code phase PNphase = ΡΝ γ * 64 + 3 _{+ n} falls within the scrambling code identification interval (PN Y+2 , PN Y+ 4 ) of the destination cell D (as shown in FIG. 5, since n cannot be corrected) Therefore, the arrow representing the multiplexed scrambling code phase has a certain interval from the center of the interval;), and the handover indication message is sent to the terminal. Adding the destination cell to an active set of the terminal.

The terminal receives the handover indication message sent by the base station controller, and performs handover. In the embodiment of the present invention, the multiplexed scrambling code phase is corrected and then identified, and the recognition error is reduced; the switching indication is sent according to the recognition result, and the handover success rate is improved.

The embodiment of the invention further provides a switching device, as shown in FIG. 6, comprising:

a receiving module 601, configured to receive a multiplexed scrambling code phase of the destination cell;

a correction module 602, configured to modify the multiplexed scrambling code phase to obtain a modified multiplexed scrambling code phase; and an identification module 603, configured to determine whether the modified multiplexed scrambling code phase is in a scrambling code identification interval of the destination cell;

The sending module 604 is configured to: if the output of the identifying module is: correcting the scrambling code phase in the scrambling code identification interval of the target cell, the sending module is configured to send a handover indication message to the terminal.

The multiplexing scrambling code phase is the target cell scrambling code multiplied by the offset of the 64-plus-target cell minus the source cell transmission delay; the starting endpoint of the scrambling code identification interval of the destination cell is the multiplexing of the destination cell The scrambling code is reduced by W chips, and the terminating end point is a multiplexing scrambling code of the destination cell plus Z chips, where w and z are natural numbers. The values of W and Z may be the same or different. .

The modifying the multiplexed scrambling code phase includes a transmission delay of the multiplexed scrambling code phase plus source cell.

In the embodiment of the present invention, the multiplexed scrambling code phase is corrected and then identified, and the recognition error is reduced; the switching indication is sent according to the identification result, and the handover success rate is improved.

Claims

Claim

A resource multiplexing method, comprising:

Allocating a multiplexing scrambling code for each cell, the multiplexing scrambling code including a scrambling code and an offset;

A neighbor list is configured for the cell using the multiplexed scrambling code.

2. The resource multiplexing method according to claim 1, further comprising:

Configure search window parameters.

The resource multiplexing method according to claim 1, wherein the cell comprises a macro cell, a micro cell, and a pico cell.

A handover method, in which a terminal moves from a source cell to a destination cell, and transmits a multiplexed scrambling code phase of the destination cell, wherein the method includes:

Receiving a multiplexed scrambling code phase of the destination cell;

The switching method according to claim 4, further comprising:

Adding the destination cell to an active set of the terminal.

The handover method according to claim 4, wherein the multiplexed scrambling code phase is a target cell scrambling code multiplied by a 64-plus-target cell offset minus a source cell transmission delay; the destination cell The starting end point of the scrambling code identification interval is that the multiplexed scrambling code of the destination cell is reduced by W chips, and the terminating end point is the multiplexed scrambling code of the destination cell plus Z chips, where IZ is a natural number.

The switching method according to claim 6, wherein the values of W and Z are the same.

The handover method according to claim 4, wherein the modifying the multiplexed scrambling code phase comprises a transmission delay of the multiplexed scrambling code phase-plus-source cell.

9. A resource multiplexing device, comprising:

a multiplexing scrambling code allocation module, configured to allocate a multiplexing scrambling code for each cell, where the multiplexing scrambling code includes a scrambling code and an offset; The neighbor list configuration module is configured to configure a neighbor list for the cell by using the multiplexing scrambling code.

10. The resource multiplexing device of claim 9, further comprising:

Parameter configuration module for configuring search window parameters.

The resource multiplexing device according to claim 9, wherein the cell comprises a macro cell, a micro cell, and a pico cell.

12. A switching device, comprising:

a correction module, configured to modify the multiplexed scrambling code phase to obtain a modified multiplexed scrambling code phase; and an identification module, configured to determine whether the modified multiplexed scrambling code phase is in a scrambling code identification interval of the destination cell;

And a sending module, if the output result of the identifying module is: modifying a scrambling code identification interval of the multiplexed scrambling code phase in the target cell, the sending module is configured to send a handover indication message to the terminal.

The switching device according to claim 12, wherein the multiplexed scrambling code phase is a target cell scrambling code multiplied by a 64-plus-target cell offset minus a source cell transmission delay; The starting end point of the scrambling code identification interval of the cell is the multiplex scrambling code of the destination cell minus W chips, and the terminating end point is the multiplex scrambling code of the destination cell plus Z chips, where Ψ and Ζ are natural numbers.

The switching device according to claim 13, wherein the values of W and Z are the same.

The switching device according to claim 12, wherein the correcting the multiplexed scrambling phase comprises a transmission delay of the multiplexed scrambling code phase-plus-source cell.