JP5745166B2 - Resource multiplexing method and apparatus, and handover method and apparatus - Google Patents

Description

  The present invention relates to the field of communication technology, and in particular, to a resource multiplexing method and apparatus, and a handover method and apparatus.

  In the initial stage of the network structure of a mobile communication network, the number of users is small and therefore generally a macro cell network structure is used for coverage. The coverage radius of a macrocell is typically 1 to 10 kilometers. As the number of network users increases, the capacity of the macrocell cannot meet the demand for service traffic. In order to compensate for the insufficient capacity of the macro cell, a micro cell (Micro-Cell) or a pico cell (Pico-Cell) is generally used in a reception area in a hot spot area. In order to improve the quality of the indoor reception area, a macro cell or a pico cell is also used as a reception area in a general indoor reception area. As shown in FIG. 1, cell A is a macro cell, and cells B, C, D, and E are micro cells. The base station controller assigns pseudo-noise codes (PN codes) X, Y, Z, U, and V to cells A, B, C, D, and E. The adjacent cell list is configured by the base station controller, and the adjacent cells B, C, D, and E of the cell A are configured in the adjacent cell list of the cell A. The protocol limits the number of neighbor cells (generally the protocol requires an IS-95 mobile phone to support 20 neighbor cells and IS-2000 to support 40 neighbor cells). The base station controller also constructs a neighbor cell list for cells B, C, D, and E.

  In areas where communication services are busy (eg Beijing Xidan), microcell systems are placed in each building to form microcells. Therefore, the neighbor cell list is more expanded, and when the number of neighbor cells required in the protocol exceeds the neighbors that need to be scheduled, the neighbors of some cells are necessarily neighbors. Cause it not to be added to the cell list, thereby causing a handover failure. At the same time, one PN code is allocated to each microcell, but PN code resources are limited (the number is 512) and cannot be allocated without limitation.

  Aspects of the present invention provide a resource multiplexing method and apparatus, and a handover method and apparatus.

In order to achieve the above object, aspects of the present invention employ the following technical solutions.
A resource multiplexing method,
Assigning multiple pseudo-noise codes to each cell, the multiple pseudo-noise codes including a pseudo-noise code and an offset;
Forming a neighbor cell list for the cell by using the multiple pseudo-noise code.

A resource multiplexing device,
A multiple pseudo noise code allocation module configured to allocate a multiple pseudo noise code to each cell, wherein the multiple pseudo noise code includes a pseudo noise code and an offset;
A resource multiplexing apparatus comprising: a neighboring cell list configuration module configured to configure a neighboring cell list for the cell by using the multiple pseudo noise code.

  In the prior art, PN codes have been used to distinguish different cells A and B. For example, PN codes X and Y may be assigned to cells A and B that occupy two pseudo noise codes, respectively. In aspects of the invention, multiple pseudo-noise codes are used to distinguish different cells A and B. For example, the multiple pseudo noise code assigned to cell A is an X-offset. The multiple pseudo noise code assigned to cell B is X + the offset. The cells A and B use the same pseudo-noise code, save pseudo-noise code resources, and mitigate neighboring cells planning pressure.

  The offset may be a set based on a particular situation, and the offset increase and offset decrease for different cells may be different.

A handover method comprising:
Moving from a source cell to a destination cell by a terminal;
Finding a pilot signal of the target cell via searching;
Transmitting a multiple pseudo noise code phase of the target cell when the quality of the pilot signal is greater than a handover threshold;
Receiving a handover command message transmitted by the base station controller.

A handover method comprising:
Receiving a multiple pseudo-noise code phase of the target cell;
Correcting the multiple pseudo-noise code phase to obtain a corrected multiple pseudo-noise code phase;
Determining whether the corrected multiple pseudo-noise code phase is within a pseudo-noise code identification range of the target cell;
A handover command message to the terminal when the corrected multiple pseudo noise code phase is within the pseudo noise code identification range of the target cell.

A handover device comprising:
A receiving module configured to receive multiple pseudo-noise code phases of the target cell;
A correction module configured to correct the multiple pseudo-noise code phase to obtain a corrected multiple pseudo-noise code phase;
An identification module configured to determine whether the corrected multiple pseudo-noise code phase is within a pseudo-noise code identification range of the target cell;
A transmission configured to send a handover command message to the terminal if the output result of the identification module indicates that the corrected multiple pseudo noise code phase is within the pseudo noise code identification range of the target cell A handover apparatus including a module.

  In aspects of the invention, multiple pseudo-noise code phases are corrected and then identified to reduce identification errors, and handover commands are transmitted based on the identification results to increase handover success rate .

FIG. 6 is a schematic diagram of cell distribution according to an embodiment of the present invention. 5 is a flowchart of a resource multiplexing method according to an embodiment of the present invention. 1 is a schematic structural diagram of a resource multiplexing device according to an embodiment of the present invention. 3 is a flowchart of a handover method according to an embodiment of the present invention. FIG. 6 is a schematic diagram of identification ranges of some cells according to an embodiment of the present invention. 1 is a schematic structural diagram of a handover apparatus according to an embodiment of the present invention.

  In order to save pseudo-noise code resources and reduce neighboring cells planning pressure, embodiments of the present invention provide a resource multiplexing method. As shown in FIG. 2, the method includes:

  201: Assign a multiple pseudo noise code to each cell, where the multiple pseudo noise code includes a pseudo noise code and an offset.

  In the IS-95A CDMA system, the PN code cycle is 32768 chips. Division is performed every 64 chips, and 512 (= 32768/64) PN codes having various phases are obtained.

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

  The multiple pseudo noise code includes a pseudo noise code and an offset. The offset may be 1, 2, and 3 chips. The offset increase and offset decrease for various cells may be different and the offset may be set based on a particular state. As shown in FIG. 1, multiple pseudo noise code Y + 1 chips are assigned to cell B. Multiple pseudo-noise code Y-1 chips are assigned to cell C. Multiple pseudo noise code Y + 3 chips are assigned to cell D. Multiple pseudo-noise code Y-3 chips are assigned to cell E.

202: Construct a neighbor cell list for the cell by using the multiple pseudo noise code.

The principle of constructing the neighbor cell list is as follows.
a. Cells that are directly geographically adjacent to each other are generally considered as neighboring cells.
b. In general, neighbor cells are required to be neighbor cells on both sides. That is, if the carrier frequency of cell A considers cell B as an adjacent cell, cell B also considers cell A as an adjacent cell.
c. For dense urban areas, station placement is relatively close (0.5 to 1.5 kilometers) and therefore many neighboring cells should be established. PN code resources are limited (the number is 512) and cannot be allocated indefinitely.

  If the neighbor cell list is constructed by using multiple pseudo noise codes for a cell, the requirement to establish many neighbor cells and save PN code resources is satisfied.

  From step 201, cells B, C, D, and E occupy only one pseudo-noise code, but it may be recognized that four cells may be shown in the neighbor cell list.

  The technical solution of the present invention also applies to macrocells, microcells and picocells.

  In order to ensure that the terminal finds all the cells B, C, D, and E using the pseudo noise code Y through the search, the resource multiplexing method further includes a search window parameter (search window parameter). Comprising configuring steps.

The search window parameter needs to be appropriately configured, and the parameter may be configured to be neither excessive nor excessive. If the parameters are configured to be excessive, irrelevant signals can also cause the search window to enter, degrading link quality, and large search windows can also be This will slow down the speed of the mobile phone being searched. If the parameters are configured to be too small, some valid active set signals will cause the active window signals to fall outside the search window, and these active set signals outside the window will become obstacles and link May significantly deteriorate the quality of the product. In an aspect of the invention, the search window parameter is configured to be two chips.

The embodiment of the present invention further provides a resource multiplexing apparatus. As shown in FIG. 3, the device
A multiple pseudo noise code assignment module 301 configured to assign a multiple pseudo noise code to each cell, wherein the multiple pseudo noise code includes a pseudo noise code and an offset;
A neighbor cell list configuration module 302 that constructs a neighbor cell list for the cell by using multiple pseudo-noise codes.

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

  The resource multiplexing apparatus in the embodiment of the present invention also includes a parameter configuration module configured to configure the search window parameter. In the embodiment of the present invention, the search window parameter is configured to be two chips. ing.

  By using the resource multiplexing method in an embodiment of the present invention, pseudo-noise code resources are saved, and neighboring cells plan for pressure.

  Embodiments of the present invention further provide a handover method. In the application scenario of the method, the terminal moves from the source cell to the target cell, and transmits the multiple pseudo noise code phase of the target cell to the base station controller. As shown in FIG. 4, the handover method includes the following steps.

  401: Receive multiple pseudo noise code phases of the target cell.

  The base station controller receives the multiple pseudo-noise code phase PNphase = PN Y * 64 + 3−m of cell D.

  402: Correct the multiple pseudo-noise code phase to obtain a corrected multiple pseudo-noise code phase.

  The base station controller corrects the multiple pseudo noise code phase based on the transmission delay of cell A in order to obtain the corrected multiple pseudo noise code phase PNphase = PN Y * 64 +3.

The correction process is as follows.
Refer to the system time (ie, Global Positioning System (GPS)) as the clock for cells A and D, and the terminal clock is related to the transmission delay of the cell in which the terminal is located. In the present invention, the terminal is handed over from cell A to cell D. Before the handover is completed, it is assumed that cell A serves the terminal and m is the signal transmission delay in cell A.

  If cell D transmits a multiplexed PN code at 10:00 in the morning, then the multiplexed PN code is transmitted by cell A to the terminal. It is assumed that the signal transmission delay m in the cell A is 10 minutes, and in this case, the time of the terminal is 10:10, and the terminal determines that the cell D has multiple PNs based on the transmission delay. It is determined that the time when the code is transmitted is 10: 10-10 minutes = 10 hours, and that the multiplex PN code phase of the target cell is PNphase = PN Y * 64 + 3−m.

  The terminal transmits multiple pseudo noise code phases to cell D. If it is assumed that the signal transmission delay in cell A is 3 minutes, the base station controller determines that the multiple PN code phase is PNphase = PN Y * 64 + 3−m + n. When the target cell is a cell or a microcell, n may be ignored because the distance from the cell or the microcell to the terminal is very short.

  The base station controller corrects and restores the multiple PN code phase, and the transmission delay m in the PNphase + cell A is equal to the multiple pseudo noise code phase PN Y * 64 + 3 + n. N cannot be corrected because the handover is not completed and the communication channel is not established between the terminal and the mobile phone.

  403: Determine whether the corrected multiple pseudo noise code phase is within the pseudo-noise code identification range of the target cell.

  The base station and the mobile phone have the same neighbor cell list, the neighbor cell list records neighbor cells, and each neighbor cell corresponds to one identification range. The starting point of the target cell pseudo noise code identification range is the target cell multiple pseudo noise code-W chip, the end point is the target cell multiple pseudo noise code + Z chip, and W and Z are natural numbers. . The values of W and Z are the same and may be different.

  The pseudo noise code identification range for cell B is (PN Y, PN Y + 2), the pseudo noise code identification range for cell C is (PN Y, PN Y-2), and the pseudo noise code identification for cell D The range is (PN Y + 2, PN Y + 4), and the pseudo noise code identification range of the cell E is (PN Y-2, PN Y-4).

  The base station controller identifies that the multiple pseudo noise code phase PNphase = PN Y * 64 + 3 + n is within the pseudo noise code identification range.

  404: If the corrected multiple pseudo noise code phase is within the pseudo noise code identification range of the target cell, send a handover command message to the terminal.

  If the multiple pseudo-noise code phase PNphase = PN Y * 64 + 3 + n is not the target cell D (n is not corrected as shown in FIG. 5, the arrow indicating the multiple pseudo-noise code phase and the center of the range) The handover command message is transmitted to the terminal when it falls within the pseudo noise code identification range (PN Y + 2, PN Y + 4). The target cell is added to the active set of the terminal.

  The terminal receives a handover command message transmitted by the base station controller and performs a handover. In embodiments of the present invention, multiple pseudo-noise code phases are corrected and then identified to reduce identification errors and a handover command is transmitted based on the identification results to increase the handover success rate.

As shown in FIG. 6, the embodiment of the present invention further provides a handover apparatus including the following.
A receiving module 601 configured to receive the multiple pseudo-noise code phase of the target cell;
A correction module 602 configured to correct the multiple pseudo-noise code phase to obtain a corrected multiple pseudo-noise code phase;
An identification module 603 configured to determine whether a corrected multiple pseudo noise code phase is within a pseudo noise code identification range of the target cell;
A transmission module configured to transmit a handover command message to the terminal if the output result of the identification module indicates that the corrected multiple pseudo noise code phase is within the pseudo noise code identification range of the target cell 604.

  The multiple pseudo noise code phase is the pseudo noise code of the target cell multiplied by 64 + the offset of the target cell−the transmission delay of the source cell, and the starting point of the pseudo noise code identification range of the target cell is The multiple pseudo noise code-W chip of the target cell, and the end point is the multiple pseudo noise code + Z chip of the target cell, and W and Z are natural numbers. W and Z may be the same or different.

  Correcting the multiple pseudo noise code phase includes adding multiple pseudo noise code phases and source cell transmission delay.

  In an embodiment of the present invention, multiple pseudo-noise code phases are corrected and then identified to reduce identification errors and a handover command is transmitted based on the identification results to increase the handover success rate.

301 Multiple Pseudo Noise Code Assignment Module 302 Adjacent Cell List Configuration Module 601 Reception Module 602 Correction Module 603 Identification Module 604 Transmission Module

Claims (7)

A handover method comprising :
Before SL method,
The handover apparatus receives the multiple pseudo-noise code phase of the target cell transmitted by the terminal moving from the source cell to the target cell ;
The handover apparatus correcting the multiple pseudo-noise code phase to obtain the corrected multiple pseudo-noise code phase; and
The handover apparatus determining whether the corrected multiple pseudo noise code phase is within a pseudo noise code identification range of the target cell;
If the corrected multiplexed pseudo noise code phase, when in said pseudo-noise code identification range of the target cell, viewed contains a step of the handover device transmits a handover command message to the terminal
The multiple pseudo noise code phase is the pseudo noise code of the target cell multiplied by 64 + the offset of the target cell−the transmission delay of the source cell;
The start point of the pseudo noise code identification range of the target cell is the multiple pseudo noise code-W chip of the target cell, and the end point of the pseudo noise code identification range of the target cell is the target cell The handover method , wherein the multiple pseudo-noise code + Z chip and W and Z are natural numbers . The handover method according to claim 1 , wherein the values of W and Z are the same. The handover method according to claim 1 or 2 , wherein the step of the handover apparatus correcting the multiple pseudo noise code phase includes adding the multiple pseudo noise code phase and the transmission delay of the source cell. The handover method according to claim 3 , further comprising the step of the handover apparatus adding the target cell to the active set of the terminal. A handover device comprising:
A receiving module configured to receive multiple pseudo-noise code phases of the target cell;
A correction module configured to correct the multiple pseudo-noise code phase to obtain a corrected multiple pseudo-noise code phase;
An identification module configured to determine whether the corrected multiple pseudo-noise code phase is within a pseudo-noise code identification range of the target cell;
A transmission configured to send a handover command message to the terminal if the output result of the identification module indicates that the corrected multiple pseudo noise code phase is within the pseudo noise code identification range of the target cell and a module only contains
The multiple pseudo noise code phase is the pseudo noise code of the target cell multiplied by 64 + the offset of the target cell−the transmission delay of the source cell;
The start point of the pseudo noise code identification range of the target cell is the multiple pseudo noise code-W chip of the target cell, and the end point of the pseudo noise code identification range of the target cell is the target cell The handover apparatus , wherein the multiple pseudo-noise code + Z chip and W and Z are natural numbers . The handover apparatus according to claim 5 , wherein the values of W and Z are the same. The handover apparatus according to claim 5 or 6 , wherein correcting the multiple pseudo noise code phase includes adding the multiple pseudo noise code phase and the transmission delay of the source cell.