CN102204313B - Resource multiplex method and device & swithcing method and device thereof - Google Patents

Abstract

The invention discloses a resource multiplex method and a device thereof, and a switching method and a switching device thereof to save scamble resource and lessen resource pressure of neighboring district planning. The resource multiplex method includes the steps of allocating multiplex scamble to every cell, wherein the multiplex scamble includes scamble and bias; using the multiplex scamble to allocate a neighboring district list for the cell. By the invention, the scamble resource is saved, and the resource pressure of the neighboring district is lessened. The products in the invention can be applied to indoor covering systems such as micro cells, pico base stations, femto base stations and the like.

Description

Resource multiplexing method and device, switching method and device

technical field

The present invention relates to the technical field of communication, in particular to a resource multiplexing method and device, and a switching method and device.

Background technique

In the initial stage of network construction of the mobile communication network, due to the relatively small number of users, the network structure of the macro cell (MacroCell) is generally used for coverage, and the coverage radius of the macro cell is generally 1 km to tens of km. With the increase of the number of network users, the capacity of the macro cell cannot meet the traffic demand. In order to make up for the insufficient capacity of the macro cell, a micro cell (Micro-Cell) or a pico cell (Pico-Cell) is generally used for coverage in hotspot areas. In order to improve the quality of indoor coverage, general indoor coverage is also covered by micro cells or pico cells. As shown in Figure 1, cell A is a macro cell, and cells B, C, D, and E are micro cells; the base station controller assigns a scrambling code (Pseudo-Noisecode, referred to as PN code) X, Y, Z, U, V; the base station controller is configured with a neighbor list, and the neighbor list of cell A is configured with cells B, C, D, and E adjacent to cell A. The agreement has restrictions on the number of adjacent cells (the general agreement stipulates that IS-95 mobile phones support 20 adjacent cells, and IS-2000 supports 40 adjacent cells); base station controllers are also configured with adjacent cells for cells B, C, D, and E list.

In areas with busy communication services (such as Xidan, Beijing), each building is equipped with a microcellular system to form a microcellular cell. As a result, the neighboring cell list becomes more and more inflated. When the number of neighboring cells to be planned exceeds the number of neighboring cells stipulated in the protocol, the neighboring relations of some cells cannot be added to the neighboring cell list, resulting in handover failure. At the same time, each micro cell is assigned a PN code, but the PN code resource is limited (512), and cannot be allocated without limit.

Contents of the invention

Embodiments of the present invention provide a resource multiplexing method and device, and a switching method and device;

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A resource reuse method, comprising:

assigning a multiplexed scrambling code to each cell, the multiplexed scrambling code including a scrambling code and an offset;

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

A resource multiplexing device, comprising:

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

A neighbor list configuration module, configured to use the multiplexed scrambling code to configure a neighbor list for a cell.

The existing technology uses PN codes to distinguish different cells A and B. For example, cells A and B can be assigned PN codes X and Y respectively, which will occupy two scrambling codes; the embodiment of the present invention uses multiplexed scrambling codes to distinguish different cells A and B, for example, the multiplexed scrambling code allocated to cell A is: X minus offset; the multiplexed scrambled code allocated to cell B is: X plus offset. Cells A and B use the same scrambling code, which saves scrambling code resources and reduces the pressure of adjacent cell planning.

The offset can be set according to specific conditions, and the offset increase and offset decrease can be different in different cells.

A switching method comprising:

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

Search for the pilot signal of the target cell;

When the quality of the pilot signal is greater than the handover threshold, send the multiplexed scrambling code phase of the target cell;

A handover indication message sent by the base station controller is received.

A switching method comprising:

receiving the multiplexed scrambling code phase of the target cell;

Correcting the multiplexed scrambling code phase to obtain the corrected multiplexing scrambling code phase;

judging whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell;

If the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, a handover indication message is sent to the terminal.

A switching device comprising:

A receiving module, configured to receive the multiplexed scrambling code phase of the target cell;

A correction module, configured to correct the multiplexed scrambling code phase to obtain the corrected multiplexed scrambling code phase;

An identification module, configured to determine whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell;

A sending module, if the output result of the identification module is: the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, the sending module is configured to send a handover instruction message to the terminal.

In the embodiment of the present invention, the phase of the multiplexed scrambling code is corrected and then identified, which reduces the identification error; and the handover instruction is sent according to the identification result, which improves the success rate of handover.

Description of drawings

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

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

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

FIG. 4 is a flowchart of a switching method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of identification intervals of some cells 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 ways

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

201. Allocate a multiplexed scrambling code for each cell, where the multiplexed scrambling code includes a scrambling code and an offset;

In the IS-95A CDMA system, the period of the PN code is 32768 chips (chip), divided every 64 chips, and 512 (=32768/64) PN codes with different phases are obtained.

A PN code is assigned to each cell. As shown in FIG. 1, cells A, B, C, D, and E occupy five scrambling codes X, Y, Z, U, and V.

The multiplexing scrambling code includes a scrambling code and an offset, and the offset can be 1, 2, 3... chips, and the offset increase and offset decrease can be different in different cells, and the offset can be performed according to specific conditions set up. As shown in Figure 1, a multiplexed scrambling code Y+1chip is allocated to cell B; a multiplexed scrambling code Y-1chip is allocated to cell C; a multiplexed scrambling code Y+3chip is allocated to cell D; Multiplex the scrambling code Y-3chip.

202. Use the multiplexed scrambling code to configure a neighboring cell list for the cell.

Neighboring cell list configuration principles: a. Geographically directly adjacent cells are generally regarded as neighboring cells; b. Adjacent cells are generally required to be adjacent to each other. A as a neighboring area; c. For dense urban areas, due to the relatively close distance between stations (0.5-1.5 kilometers), more work should be done in neighboring areas. PN code resources are limited (512), and cannot be allocated without limit.

Using the multiplexed scrambling code to configure the neighboring cell list for the cellular cell satisfies the requirement that more neighboring cells should do more while saving PN code resources.

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

The technical scheme of the present invention is also applicable to macro cells, micro cells and pico cells.

In order to ensure that the terminal can search for all cells B, C, D, and E using the scrambling code Y, the resource multiplexing method further includes: a step of configuring search window parameters.

The parameters of the search window should be configured reasonably. This parameter cannot be configured too large or too small; if the parameter is configured too large. If the parameter configuration is too large, some irrelevant signals will also fall within the search window, which will affect the link quality; if the search window is too large, the mobile phone will slow down the speed of searching for adjacent pilots; if the parameter configuration is too small , it will cause some useful active set signals to fall outside the search window, and these missing active set signals outside the window will become interference, which may seriously affect the link quality; in the embodiment of the present invention, the search window parameters are configured as two chips.

The embodiment of the present invention also provides a resource multiplexing device, as shown in Figure 3, the device includes:

A multiplexed scrambling code allocation module 301, configured to allocate a multiplexed scrambling code for each cell, where the multiplexed scrambling code includes a scrambling code and an offset;

A neighbor list configuration module 302, configured to use the multiplexed scrambling code to configure a neighbor list for the cell.

The cells include macro cells, micro cells and pico cells; the offset is 1 chip.

The resource multiplexing device in the embodiment of the present invention further includes: a parameter configuration module configured to configure search window parameters; in the embodiment of the present invention, the search window parameters are configured as 2 chips.

The resource multiplexing method in the embodiment of the present invention saves scrambling code resources and reduces the pressure of adjacent cell planning.

The embodiment of the present invention also provides a switching 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 target cell to the base station controller. As shown in Figure 4, the switching method includes the following steps:

401. Receive the multiplexed scrambling code phase of the destination cell;

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

402. Correct the multiplexed scrambling code phase to obtain the corrected multiplexed scrambling code phase;

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

The correction process is as follows:

The clocks of cells A and D refer to the system time (i.e. the Global Positioning System GPS Global Positioning System); the clock of the terminal is related to the transmission time delay of the cell where it is located; in the present invention, the terminal switches from cell A to cell D; Before the handover is completed, the cell A provides services for the terminal, assuming that m is the transmission delay of the signal in the cell A.

If the cell D sends the multiplexed PN code at 10:00 in the morning, it will reach the terminal through the transmission of the cell A; assuming that the transmission delay m of the signal in the cell A is 10 minutes, at this time, the time of the terminal is 10:10 , according to the transmission delay, the terminal judges that the time for cell D to send the multiplexed PN code is 10:10-10:00 = 10:00, and determines that the phase of the multiplexed PN code of the destination cell is: PNphase=PN Y*64+3- m;

The terminal sends the phase of the multiplexed scrambling code 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 phase of the multiplexed PN code is: PNphase=PN Y*64+3-m+ n; where, when the target cell is a cell or a micro cell, n can be ignored because the distance from the cell or micro cell to the terminal is very short.

The base station controller corrects and restores the phase of the multiplexed PN code. PNphase adds the transmission delay m in the cell A to obtain the multiplexed scrambling code phase PN Y*64+3+n. Since the handover has not been completed, the terminal and the mobile phone No communication channel has been established between them, so n cannot be corrected.

403. Determine whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell;

Both the base station and the mobile phone have the same neighbor list, which records adjacent cells, and each cell corresponds to an identification interval. The starting endpoint of the scrambling code identification interval of the target cell is the multiplexing scrambling code of the target cell minus W chips, and the ending point is the multiplexing scrambling code of the target cell plus Z chips, where W and Z are Natural number. The values of W and Z may be the same or different.

The scrambling code identification interval of cell B (PN Y, PN Y+2); the scrambling code identification interval of cell C (PN Y, PN Y-2); the scrambling code identification interval of cell D (PN Y+2, PN Y+4); the scrambling code identification interval of cell E (PN Y-2, PN Y-4).

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

404. If the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, send a handover indication message to the terminal.

If the multiplexing scrambling code phase PNphase=PN Y*64+3+n falls within the scrambling code identification interval (PN Y+2, PN Y+4) of the destination cell D (as shown in Figure 5, because n cannot correction, so there is a certain interval between the arrow representing the phase of the multiplexed scrambling code and the center of the interval), then a handover indication message is sent to the terminal. adding the target cell to the active set of the terminal.

The terminal receives the handover instruction message sent by the base station controller, and performs handover. In the embodiment of the present invention, the phase of the multiplexed scrambling code is corrected and then identified, which reduces the identification error; and the handover instruction is sent according to the identification result, which improves the success rate of handover.

The embodiment of the present invention also provides a switching device, as shown in Figure 6, including:

A receiving module 601, configured to receive the multiplexed scrambling code phase of the target cell;

A correction module 602, configured to correct the multiplexed scrambling code phase to obtain the corrected multiplexed scrambling code phase;

An identification module 603, configured to determine whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell;

The sending module 604, if the output result of the identification module is: the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, the sending module is configured to send a handover indication message to the terminal.

The phase of the multiplexing scrambling code is the multiplication of the scrambling code of the target cell by 64 plus the offset of the target cell minus the transmission delay of the source cell; the starting point of the scrambling code identification interval of the target cell is the multiplexing scrambling code of the target cell Subtract W chips, and add Z chips to the multiplexing scrambling code of the destination cell at the termination endpoint, 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 adding the multiplexed scrambling code phase to the transmission delay of the source cell.

In the embodiment of the present invention, the phase of the multiplexed scrambling code is corrected and then identified, which reduces the identification error; and the handover instruction is sent according to the identification result, which improves the success rate of handover.

Claims (5)

1. A handover method, the terminal moves from the source cell to the target cell, and sends the multiplexing scrambling code phase of the target cell, it is characterized in that the multiplexing scrambling code includes the scrambling code and offset of N*64 chips Wherein, N is less than or equal to 512, N is an integer, the method includes: Receiving the multiplexing scrambling code phase of the target cell, the multiplexing scrambling code phase is the scrambling code of the target cell multiplied by 64 plus the offset of the target cell minus the transmission delay of the source cell; Correcting the multiplexed scrambling code phase to obtain a corrected multiplexing scrambling code phase, wherein the correcting the multiplexing scrambling code phase includes the multiplexing scrambling code phase plus the transmission delay of the source cell; Judging whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, the starting endpoint of the scrambling code identification interval of the target cell is the multiplexed scrambling code of the target cell minus W chips, and terminating The endpoint adds Z chips to the multiplexing scrambling code of the destination cell, where W and Z are natural numbers; If the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, a handover indication message is sent to the terminal. 2. The switching method according to claim 1, further comprising: adding the target cell to the active set of the terminal. 3. The handover method according to claim 1, characterized in that the values of W and Z are the same. 4. A switching device, characterized in that it comprises: The receiving module is used to receive the multiplexed scrambling code phase of the target cell, the multiplexed scrambling code includes N*64 chip scrambling code and offset, where N is less than or equal to 512, N is an integer, and the multiplexing The scrambling code phase is the scrambling code of the destination cell multiplied by 64 plus the offset of the destination cell minus the transmission delay of the source cell; A correction module, configured to correct the phase of the multiplexed scrambling code to obtain a corrected phase of the multiplexed scrambling code, wherein the correction of the phase of the multiplexed scrambling code includes the phase of the multiplexing scrambling code plus the transmission delay of the source cell; An identification module, configured to determine whether the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, where the starting endpoint of the scrambling code identification interval of the target cell is the multiplexed scrambling code minus W of the target cell chips, the termination endpoint is the multiplexing scrambling code of the destination cell plus Z chips, where W and Z are natural numbers; A sending module, if the output result of the identification module is: the corrected multiplexed scrambling code phase is within the scrambling code identification interval of the target cell, the sending module is configured to send a handover instruction message to the terminal. 5. The switching device according to claim 4, wherein the values of W and Z are the same.

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