CN101873650B - Switching method and device of user equipment in spatial division multiple access - Google Patents
Switching method and device of user equipment in spatial division multiple access Download PDFInfo
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Abstract
The invention discloses a switching method and a device of user equipment (UE) in spatial division multiple access (SDMA). The corresponding relationship between channels in a cell and the channels of the adjacent cell is simultaneously configured when configuring the corresponding relationship between the cell and the adjacent cell, and a wireless network controller (RNC) can decide which channel of which target cell where the UE to be switched is switched to during the switching according to the two relationships, thereby leading the UE to be switched and the existing UE of the channel to equally share carrier waves of the channel when distributing resources, ensuring that the business in the target cell is not affected when switching the UE and not increasing the probability of call drop.
Description
Technical Field
The present invention relates to a handover technology, and in particular, to a method and an apparatus for handover of User Equipment (UE) in Spatial Division Multiple Access (SDMA).
Background
SDMA techniques use spatial characteristics as a form of resource partitioning so that UEs located in different directions or in different coverage areas use the same timeslot, carrier, and code channel resources. Specifically, the SDMA technique sets up N channels in a cell with a spatial ranking condition, each channel configures carriers 0 to M, and the same carriers located in different channels can be allocated to different UEs as resources. In SDMA, different users can use the same air interface resource by accessing the users to different channels, thereby improving the capacity of the system.
At present, when a UE accesses a certain cell, the UE reports a channel number to be accessed to a Radio Network Controller (RNC) through a Radio Resource Control (RRC) message, and the RNC accesses the UE to the channel and equally divides all UEs in the channel on each carrier, that is, allocates different carriers to each UE in the channel as much as possible, so as to improve the rate of a single user and the throughput of the whole cell to the maximum extent.
The biggest characteristic of a wireless communication user is the continuity of the service in the moving process, in the prior art, different adjacent cells are configured for each cell in network planning to ensure the continuity in the moving process, but after a channel is introduced by the SDMA technology, the concept of the adjacent channel is not introduced in the prior art, which brings problems to UE switching.
Fig. 1 is a flowchart of a UE handover method in SDMA in the prior art, which includes:
step 101: and the RNC switches the UE according to the measurement report and an algorithm strategy decision, and selects a target cell from the adjacent cells of the current cell of the UE when the switching condition is met.
Step 102: and the RNC allocates resources for the UE in the target cell.
In this step, the RNC allocates resources according to the load condition and the interference condition of the target cell and the requirements of the service itself performed by the UE.
The resource allocation procedure of this step is illustrated as an example. Fig. 2 is a schematic diagram of the RNC allocating resources to the UE in the flow shown in fig. 1, in this example, a source side is a cell initially accessed by the UE1, and a target side is a cell to which the UE1 needs to be switched during a service process. Since the RNC cannot decide which channel of the target cell to handover the UE to, only the carriers with less load, less interference and meeting the service requirements can be randomly allocated to the UE 1. As shown in fig. 2, the target itself has two carriers F0 and F1, and the two carriers have been allocated to UE5 and UE6, respectively, and from the viewpoint of load, the two carriers are the same, and assuming that the interference of carrier F1 is small and meets the service requirement, the RNC can allocate carrier F1 to UE 1.
Step 103: the RNC performs a handover procedure.
Step 104: the RNC judges whether the switching is successful, if so, the step 105 is executed, otherwise, the step 101 is executed.
Step 105: and the RNC updates the internal data and completes the switching.
Step 106: the RNC adjusts the UE and other existing UEs in the channel according to the channel number reported by the base station where the UE is switched, and performs Dynamic Channel Allocation (DCA) to ensure that all UEs in the channel perform carrier averaging.
In this step, as still taking fig. 2 as an example, since channel 1 of the target cell only includes carrier F0 in fig. 2, the result of carrier averaging is that both UE5 and UE1 allocate carrier F0.
As can be seen from the flow shown in fig. 1, the UE handover method in SDMA in the prior art has the following problems:
1. when resources are allocated in the switching process, the RNC cannot know which channel of the target cell the UE is switched to, so that the resources can be randomly allocated to the UE only according to the load condition, the interference condition and the requirement of the service, and the load of certain carriers of individual channels is overlarge after the UE is switched into the target cell, thereby affecting the service of the target cell and even causing service interruption;
2. after the handover is completed, in order to improve the rate of a single user and the throughput of the whole cell to the maximum extent, the RNC further needs to execute DCA on all UEs in the channel according to the channel number of the UE reported by the base station, which lengthens the time delay on the one hand, and increases the probability of call drop through frequent adjustment on the other hand.
Disclosure of Invention
The invention provides a method for switching UE in SDMA, which can ensure that the service in a target cell is not influenced and the probability of call drop is not increased when the UE is switched.
The invention provides a switching device of UE in SDMA, which can ensure that the service in a target cell is not influenced and the probability of call drop is not increased when the UE is switched.
The technical scheme of the invention is realized as follows:
a switching method of user equipment in spatial hierarchical multiple access is characterized in that a first corresponding relation between a cell and an adjacent cell is configured in a Radio Network Controller (RNC), and a second corresponding relation between a channel in the cell and a channel in the adjacent cell is configured; the method further comprises the following steps:
the RNC determines a target cell from adjacent cells corresponding to the source cell according to the source cell where the user equipment UE to be switched is located and the first corresponding relation;
the RNC selects a target channel for the UE to be switched from the channel of the target cell according to the channel where the UE to be switched is located in the source cell and the second corresponding relation;
RNC distributes resources for UE to be switched, and enables the UE to be switched and the existing UE in the target channel to equally divide each carrier in the target channel;
and the RNC switches the UE to be switched to a target channel in the target cell.
A switching device of user equipment in spatial hierarchical multiple access (SDMA) is characterized in that the device comprises:
the device comprises a storage module, a first mapping module and a second mapping module, wherein the storage module is used for storing a first mapping relation between a cell and an adjacent cell thereof and a second mapping relation between a channel in the cell and a channel in the adjacent cell thereof;
a determining module, configured to determine a target cell from neighboring cells corresponding to a source cell according to the source cell in which a UE to be switched is located and the first corresponding relationship; selecting a target channel for the UE to be switched from the channels of the target cell according to the channel in the source cell where the UE to be switched is located and the second corresponding relation;
the resource allocation module is used for allocating resources for the UE to be switched so that the UE to be switched and the existing UE in the target channel equally divide each carrier in the target channel;
and the switching module is used for switching the UE to be switched to a target channel in the target cell.
It can be seen that, the method for switching UE in SDMA of the present invention configures the corresponding relationship between the cell and its neighboring cells, and also configures the corresponding relationship between the channel in the cell and the channel in its neighboring cells, and the RNC can decide which channel of which target cell the UE to be switched will be switched to during the switching according to the two corresponding relationships, so that the UE to be switched and the existing UEs of the channel can both share the carrier of the channel when allocating resources, and the speed of a single user and the throughput of the whole cell are improved to the maximum extent. Therefore, the RNC avoids the situation that resources are randomly allocated to the UE to be switched like the prior art, and executes DCA on the channel according to the channel number reported by the base station after the switching is finished, so that the service in the target cell is not influenced and the probability of call drop is not increased when the UE is switched.
Drawings
FIG. 1 is a flowchart of a UE handover method in SDMA according to the prior art;
FIG. 2 is a diagram illustrating a resource allocation for a UE by an RNC in the procedure shown in FIG. 1;
FIG. 3 is a flowchart of a UE handover method in SDMA according to the present invention;
FIG. 4 is a flowchart illustrating a method for switching UE in SDMA according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a UE switching apparatus in SDMA according to the present invention.
Detailed Description
To make the objects and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Fig. 3 is a flowchart of a UE handover method in SDMA according to the present invention, where before the start of the procedure, a first mapping relationship between a cell and its neighboring cells is configured in an RNC, and a second mapping relationship between channels in the cell and channels in its neighboring cells is configured.
The flow shown in fig. 3 includes:
step 301: and the RNC determines a target cell from the adjacent cells corresponding to the source cell according to the source cell where the UE to be switched is located and the first corresponding relation.
Step 302: and the RNC selects a target channel for the UE to be switched from the channel of the target cell according to the channel where the UE to be switched in the source cell is located and the second corresponding relation.
Step 303: and the RNC distributes resources for the UE to be switched so that the UE to be switched and the existing UE in the target channel equally divide each carrier in the target channel.
Step 304: and the RNC switches the UE to be switched to a target channel in the target cell.
It can be seen that, the method for switching UE in SDMA of the present invention configures the corresponding relationship between the cell and its neighboring cells, and also configures the corresponding relationship between the channel in the cell and the channel in its neighboring cells, and the RNC can decide which channel of which target cell the UE to be switched will be switched to during the switching according to the two corresponding relationships, so that the UE to be switched and the existing UEs of the channel can both share the carrier of the channel when allocating resources, and the speed of a single user and the throughput of the whole cell are improved to the maximum extent. Therefore, the RNC avoids the situation that resources are randomly allocated to the UE to be switched like the prior art, and executes DCA on the channel according to the channel number reported by the base station after the switching is finished, so that the service in the target cell is not influenced and the probability of call drop is not increased when the UE is switched.
Fig. 4 is a flowchart of an embodiment of a method for switching UE in SDMA according to the present invention, where in this embodiment, according to a network plan, a first corresponding relationship between a cell and its neighboring cells is configured in an RNC, and a second corresponding relationship between a channel in the cell and a channel in its neighboring cells is configured.
The second mapping relationship is configured by selecting at most one geographically adjacent channel in each adjacent cell of the cell for each channel in the cell, and establishing the mapping relationship.
The flow shown in fig. 4 includes:
step 401: and the RNC switches the UE according to the measurement report and the algorithm strategy decision.
Step 402: and the RNC determines a target cell from the adjacent cells corresponding to the source cell according to the source cell where the UE to be switched is located and the first corresponding relation.
Step 403: and the RNC selects a target channel for the UE to be switched from the channels of the target cell according to the channel where the UE to be switched is located in the source cell and the second corresponding relation.
Step 404: and the RNC distributes resources for the UE to be switched so that the UE to be switched and the existing UE in the target channel equally divide each carrier in the target channel.
Step 405: and the RNC switches the UE to be switched to a target channel in the target cell.
Step 406: the RNC judges whether the handover is successful, if so, step 407 is executed; otherwise, step 402 is performed.
In this step, if the current handover is not successful, the RNC will re-determine the target cell and the target channel after returning to step 402.
Step 407: and the RNC updates the internal data and ends the process.
In order to realize the UE switching method in SDMA, the invention also provides a UE switching device in SDMA, which is positioned at one side of RNC, can be integrated in RNC, or can be an independent device connected with RNC.
Fig. 5 is a schematic structural diagram of a UE switching apparatus in SDMA according to the present invention, the apparatus comprising: the device comprises a storage module, a determination module, a resource allocation module and a switching module. Wherein,
the storage module is used for storing a first corresponding relation between a cell and an adjacent cell thereof and a second corresponding relation between a channel in the cell and a channel in the adjacent cell thereof.
A determining module, configured to determine a target cell from neighboring cells corresponding to a source cell according to the source cell in which a UE to be switched is located and the first correspondence; and selecting a target channel for the UE to be switched from the channels of the target cell according to the channel in the source cell where the UE to be switched is located and the second corresponding relation.
And the resource allocation module is used for allocating resources for the UE to be switched so that the UE to be switched and the existing UE in the target channel can equally allocate each carrier in the target channel.
And the switching module is used for switching the UE to be switched to a target channel in the target cell.
In order to reselect the target cell and the target channel when the handover is unsuccessful, the apparatus further includes: the device comprises a judging module and a data updating module. Wherein,
the judging module is used for judging whether the switching of the switching module is successful or not, and if so, the data updating module is triggered; otherwise, triggering the determining module to execute operation again.
And the data updating module is triggered by the judging module and is used for updating the data in the RNC.
The device further comprises: and the decision module is used for switching the UE to be switched according to the measurement report and the algorithm strategy decision and then triggering the determination module to execute the operation.
Each module in the above device executes operations according to the corresponding steps in the method of the present invention, and the specific process of execution is not described herein again.
In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A switching method of user equipment in spatial hierarchical multiple access is characterized in that a first corresponding relation between a cell and an adjacent cell is configured in a Radio Network Controller (RNC), and a second corresponding relation between a channel in the cell and a channel in the adjacent cell is configured; the method further comprises the following steps:
the RNC determines a target cell from adjacent cells corresponding to the source cell according to the source cell where the user equipment UE to be switched is located and the first corresponding relation;
the RNC selects a target channel for the UE to be switched from the channel of the target cell according to the channel where the UE to be switched is located in the source cell and the second corresponding relation;
RNC distributes resources for UE to be switched, and enables the UE to be switched and the existing UE in the target channel to equally divide each carrier in the target channel;
and the RNC switches the UE to be switched to a target channel in the target cell.
2. The method of claim 1, wherein the second correspondence between the tunnel in the configured cell and the tunnels in its neighboring cells is:
and aiming at each channel in the cell, selecting at most one channel adjacent to the geographical position in each adjacent cell of the cell, and establishing a corresponding relation.
3. The method of claim 1 or 2, wherein after the RNC performs the handover, further comprising:
and the RNC judges whether the switching is successful, if so, the process is ended after internal data is updated, otherwise, the step of determining the target cell from the adjacent cell corresponding to the source cell is returned to be executed again.
4. The method of claim 3, wherein when the step of re-determining the target cell from the neighboring cells corresponding to the source cell is performed, the re-determined target cell is different from the target cell determined before the re-performing.
5. The method of claim 1 or 2, wherein before determining the target cell from the neighboring cells corresponding to the source cell, further comprising:
and the RNC switches the UE to be switched according to the measurement report and the algorithm strategy decision.
6. An apparatus for handover of a user equipment in spatial hierarchical multiple access, the apparatus comprising:
the device comprises a storage module, a first mapping module and a second mapping module, wherein the storage module is used for storing a first mapping relation between a cell and an adjacent cell thereof and a second mapping relation between a channel in the cell and a channel in the adjacent cell thereof;
a determining module, configured to determine a target cell from neighboring cells corresponding to a source cell according to the source cell in which a UE to be switched is located and the first corresponding relationship; selecting a target channel for the UE to be switched from the channels of the target cell according to the channel in the source cell where the UE to be switched is located and the second corresponding relation;
the resource allocation module is used for allocating resources for the UE to be switched so that the UE to be switched and the existing UE in the target channel equally divide each carrier in the target channel;
and the switching module is used for switching the UE to be switched to a target channel in the target cell.
7. The apparatus of claim 6, further comprising: the device comprises a judgment module and a data updating module;
the judging module is used for judging whether the switching of the switching module is successful, and if so, the data updating module is triggered; otherwise, triggering the determining module to execute operation again;
and the data updating module is triggered by the judging module and is used for updating the data in the radio network controller RNC.
8. The apparatus of claim 6 or 7, further comprising: and the decision module is used for switching the UE to be switched according to the measurement report and the algorithm strategy decision and then triggering the determination module to execute the operation.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0743802A2 (en) * | 1995-05-19 | 1996-11-20 | Alcatel SEL Aktiengesellschaft | Processor controlled arrangement for mobile station tracking in a mobile radio system with space division multiple access |
| CN1244998A (en) * | 1996-12-04 | 2000-02-16 | 诺基亚电信股份公司 | Controlling handover in a mobile communication network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0743802A2 (en) * | 1995-05-19 | 1996-11-20 | Alcatel SEL Aktiengesellschaft | Processor controlled arrangement for mobile station tracking in a mobile radio system with space division multiple access |
| CN1244998A (en) * | 1996-12-04 | 2000-02-16 | 诺基亚电信股份公司 | Controlling handover in a mobile communication network |
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